diff --git a/Pipfile.lock b/Pipfile.lock
index 381ab55..67557db 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -33,10 +33,11 @@
         },
         "atomicwrites": {
             "hashes": [
-                "sha256:240831ea22da9ab882b551b31d4225591e5e447a68c5e188db5b89ca1d487585",
-                "sha256:a24da68318b08ac9c9c45029f4a10371ab5b20e4226738e150e6e7c571630ae6"
+                "sha256:6b5282987b21cd79151f51caccead7a09d0a32e89c568bd9e3c4aaa7bbdf3f3a",
+                "sha256:e16334d50fe0f90919ef7339c24b9b62e6abaa78cd2d226f3d94eb067eb89043"
             ],
-            "version": "==1.1.5"
+            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.3.*' and python_version != '3.2.*'",
+            "version": "==1.2.0"
         },
         "attrs": {
             "hashes": [
@@ -55,10 +56,10 @@
         },
         "bleach": {
             "hashes": [
-                "sha256:b8fa79e91f96c2c2cd9fd1f9eda906efb1b88b483048978ba62fef680e962b34",
-                "sha256:eb7386f632349d10d9ce9d4a838b134d4731571851149f9cc2c05a9a837a9a44"
+                "sha256:0ee95f6167129859c5dce9b1ca291ebdb5d8cd7e382ca0e237dfd0dad63f63d8",
+                "sha256:24754b9a7d530bf30ce7cbc805bc6cce785660b4a10ff3a43633728438c105ab"
             ],
-            "version": "==2.1.3"
+            "version": "==2.1.4"
         },
         "boltons": {
             "hashes": [
@@ -106,11 +107,11 @@
         },
         "datasketch": {
             "hashes": [
-                "sha256:016c3fe1c3034b772cba9c220466fb52a59fbb258dd538fb73467c42e71536ea",
-                "sha256:b1d37340d3eebd28868cd028a3866cb53565fc9f929f856bbabb29a96995c16b"
+                "sha256:6bac089d885f8316f8baf80b9a675f5254a0b80cede13e11f2e2d8c801302872",
+                "sha256:a1e28a820aac89fb378dde88cf75fc05c813d2d71e5e35a57bd5d680ead241cc"
             ],
             "index": "pypi",
-            "version": "==1.2.6"
+            "version": "==1.2.7"
         },
         "decorator": {
             "hashes": [
@@ -133,6 +134,7 @@
                 "sha256:10ad569bb245e7e2ba425285b9fa3e8178a0dc92fc53b1e1c553805e15a8825b",
                 "sha256:d2d587dde06f99545fb13a383d2cd336a8ff1f359c5839ce3a64c917d10c029f"
             ],
+            "markers": "python_version >= '2.7'",
             "version": "==0.2.3"
         },
         "fiona": {
@@ -168,11 +170,11 @@
         },
         "geopy": {
             "hashes": [
-                "sha256:8e02ef151c10dadacee3617f46494a1f80ef18943b507d417b3ad0ebdaa39844",
-                "sha256:c501942dbefd40e02497ec434213d0e7965427aac0748397bcda69a2372f6dcf"
+                "sha256:76654405eb69b01a2b8d113ab2ae101513cbeeb1272b0a472a7050631dadefa0",
+                "sha256:a70ff7d0fed8574384a033b46a0cd07ed7bf824901031da6e315f63e6d70394e"
             ],
             "index": "pypi",
-            "version": "==1.15.0"
+            "version": "==1.16.0"
         },
         "html5lib": {
             "hashes": [
@@ -183,12 +185,12 @@
         },
         "invoke": {
             "hashes": [
-                "sha256:1db6cf918e5df10efe4d61101b19763abe1510b6b2fe8c553daba25476de8044",
-                "sha256:265eead8c89805a2ac5083200842db6da7636ac63fb4fe0d1121b930770f3e2a",
-                "sha256:3e8e2c2e69493227e210a1d19ccc7c44189240385dda4c9b8eb5d98fa0f68a3e"
+                "sha256:1c2cf54c9b9af973ad9704d8ba81b225117cab612568cacbfb3fc42958cc20a9",
+                "sha256:334495ea16e73948894e9535019f87a88a44b73e7977492b12c2d1b5085f8197",
+                "sha256:54bdd3fd0245abd1185e05359fd2e4f26be0657cfe7d7bb1bed735e054fa53ab"
             ],
             "index": "pypi",
-            "version": "==1.1.0"
+            "version": "==1.1.1"
         },
         "ipykernel": {
             "hashes": [
@@ -200,11 +202,11 @@
         },
         "ipython": {
             "hashes": [
-                "sha256:a0c96853549b246991046f32d19db7140f5b1a644cc31f0dc1edc86713b7676f",
-                "sha256:eca537aa61592aca2fef4adea12af8e42f5c335004dfa80c78caf80e8b525e5c"
+                "sha256:007dcd929c14631f83daff35df0147ea51d1af420da303fd078343878bd5fb62",
+                "sha256:b0f2ef9eada4a68ef63ee10b6dde4f35c840035c50fd24265f8052c98947d5a4"
             ],
             "index": "pypi",
-            "version": "==6.4.0"
+            "version": "==6.5.0"
         },
         "ipython-genutils": {
             "hashes": [
@@ -215,10 +217,10 @@
         },
         "ipywidgets": {
             "hashes": [
-                "sha256:3ce93db970a94f06f38121da70757cdbcce884ecd14f79a4dd9bc49a47e0f33b",
-                "sha256:eeb188429070aa3ce16e5e6e744437614e8315b5097d6cf31b0e83fb7a5a6342"
+                "sha256:100f4ea495e1fa2c1dfeabb68641af2302e65e877003f910be4e29f3aa68a0b2",
+                "sha256:fd24a66d82f2ea49e281da7714a7c656340d3ec24dff376b17590fa59469b817"
             ],
-            "version": "==7.3.0"
+            "version": "==7.4.0"
         },
         "jedi": {
             "hashes": [
@@ -280,18 +282,18 @@
         },
         "jupyterlab": {
             "hashes": [
-                "sha256:6a1af69fe0c0890891b5bb4cb9914edca68ed59b00ed50cd2bc78e230c739b55",
-                "sha256:88290656a2db2e38ef913a257ec283f3b5bd99144ed3d52899c9af7030077554"
+                "sha256:3d0d5671b6c47b023d426452a946c0bed1746b7fd317bd6d8851dd197eb58cb0",
+                "sha256:f7a41c8f7126577a1defaf6522377fc175d1fea98b75e9b0bcf80f127e922283"
             ],
             "index": "pypi",
-            "version": "==0.32.1"
+            "version": "==0.34.3"
         },
         "jupyterlab-launcher": {
             "hashes": [
-                "sha256:c78646afa354856a7ba3d9583122b89603d24587126f4c49a04dd42f50c831ec",
-                "sha256:d6308617fbdb3949c76356e8149c9835b65b01653fdefd983085c61d75f3c810"
+                "sha256:bd91a0938d415fed3a9214aa918a66dd90ccff0c5b59c8a73134b1e6afd857c6",
+                "sha256:f880eada0b8b1f524d5951dc6fcae0d13b169897fc8a247d75fb5beadd69c5f0"
             ],
-            "version": "==0.10.5"
+            "version": "==0.13.1"
         },
         "kiwisolver": {
             "hashes": [
@@ -324,12 +326,14 @@
                 "sha256:efabbcd4f406b532206b8801058c8bab9e79645b9880329253ae3322b7b02cd5",
                 "sha256:f923406e6b32c86309261b8195e24e18b6a8801df0cfc7814ac44017bfcb3939"
             ],
+            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.3.*' and python_version != '3.2.*'",
             "version": "==1.0.1"
         },
         "langcodes": {
             "hashes": [
                 "sha256:22cff103b6c0f3c9907d9a51c2d634177a50a189672ad16d959a3e2cd48eadab"
             ],
+            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.3.*' and python_version != '3.2.*'",
             "version": "==1.4.1"
         },
         "marisa-trie": {
@@ -337,6 +341,7 @@
                 "sha256:4419abb6b603c97e863fad994abe57ed247fb12491f4bbacb2d762bd2e8958b6",
                 "sha256:c73bc25d868e8c4ea7aa7f1e19892db07bba2463351269b05340ccfa06eb2baf"
             ],
+            "markers": "python_version != '3.3.*' and python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*'",
             "version": "==0.7.5"
         },
         "markupsafe": {
@@ -347,31 +352,30 @@
         },
         "matplotlib": {
             "hashes": [
-                "sha256:07055eb872fa109bd88f599bdb52065704b2e22d475b67675f345d75d32038a0",
-                "sha256:0f2f253d6d51f5ed52a819921f8a0a8e054ce0daefcfbc2557e1c433f14dc77d",
-                "sha256:1770b70622b78f3fd76638526b8c176af8b23a0b129e0190d9407fa403855e0c",
-                "sha256:1ef9fd285334bd6b0495b6de9d56a39dc95081577f27bafabcf28e0d318bed31",
-                "sha256:3eb17a4dc45e1ceefb899423e8152e10169fa281f960421c762fd8532186c323",
-                "sha256:3fb2db66ef98246bafc04b4ef4e9b0e73c6369f38a29716844e939d197df816a",
-                "sha256:3fd90b407d1ab0dae686a4200030ce305526ff20b85a443dc490d194114b2dfa",
-                "sha256:45dac8589ef1721d7f2ab0f48f986694494dfcc5d13a3e43a5cb6c816276094e",
-                "sha256:4bb10087e09629ba3f9b25b6c734fd3f99542f93d71c5b9c023f28cb377b43a9",
-                "sha256:4dc7ef528aad21f22be85e95725234c5178c0f938e2228ca76640e5e84d8cde8",
-                "sha256:4f6a516d5ef39128bb16af7457e73dde25c30625c4916d8fbd1cc7c14c55e691",
-                "sha256:70f0e407fbe9e97f16597223269c849597047421af5eb8b60dbaca0382037e78",
-                "sha256:7b3d03c876684618e2a2be6abeb8d3a033c3a1bb38a786f751199753ef6227e6",
-                "sha256:8944d311ce37bee1ba0e41a9b58dcf330ffe0cf29d7654c3d07c572215da68ac",
-                "sha256:8ff08eaa25c66383fe3b6c7eb288da3c22dcedc4b110a0b592b35f68d0e093b2",
-                "sha256:9d12378d6a236aa38326e27f3a29427b63edce4ce325745785aec1a7535b1f85",
-                "sha256:abfd3d9390eb4f2d82cbcaa3a5c2834c581329b64eccb7a071ed9d5df27424f7",
-                "sha256:bc4d7481f0e8ec94cb1afc4a59905d6274b3b4c389aba7a2539e071766671735",
-                "sha256:c78883145da9b5620aec523fa14ea814e07f2ba26a16b7f68ff7300604a911b3",
-                "sha256:dc0ba2080fd0cfdd07b3458ee4324d35806733feb2b080838d7094731d3f73d9",
-                "sha256:f26fba7fc68994ab2805d77e0695417f9377a00d36ba4248b5d0f1e5adb08d24",
-                "sha256:f397479742c1ca31805a4bffdfcc5f6189a31116b79aa0b83a50c689f42a23bb"
+                "sha256:0ba8e3ec1b0feddc6b068fe70dc38dcf2917e301ad8d2b3f848c14ad463a4157",
+                "sha256:10a48e33e64dbd95f0776ba162f379c5cc55301c2d155506e79ce0c26b52f2ce",
+                "sha256:1376535fe731adbba55ab9e48896de226b7e89dbb55390c5fbd8f7161b7ae3be",
+                "sha256:16f0f8ba22df1e2c9f06c87088de45742322fde282a93b5c744c0f969cf7932e",
+                "sha256:1c6c999f2212858021329537f8e0f98f3f29086ec3683511dd1ecec84409f51d",
+                "sha256:2316dc177fc7b3d8848b49365498de0c385b4c9bba511edddd24c34fbe3d37a4",
+                "sha256:3398bfb533482bf21974cecf28224dd23784ad4e4848be582903f7a2436ec12e",
+                "sha256:3477cb1e1061b34210acc43d20050be8444478ff50b8adfac5fe2b45fc97df01",
+                "sha256:4259ea7cb2c238355ee13275eddd261d869cefbdeb18a65f35459589d6d17def",
+                "sha256:4addcf93234b6122f530f90f485fd3d00d158911fbc1ed24db3fa66cd49fe565",
+                "sha256:50c0e24bcbce9c54346f4a2f4e97b0ed111f0413ac3fe9954061ae1c8aa7021f",
+                "sha256:62ed7597d9e54db6e133420d779c642503c25eba390e1178d85dfb2ba0d05948",
+                "sha256:69f6d51e41a17f6a5f70c56bb10b8ded9f299609204495a7fa2782a3a755ffc5",
+                "sha256:6d232e49b74e3d2db22c63c25a9a0166d965e87e2b057f795487f1f244b61d9d",
+                "sha256:7355bf757ecacd5f0ac9dd9523c8e1a1103faadf8d33c22664178e17533f8ce5",
+                "sha256:886b1045c5105631f10c1cbc999f910e44d33af3e9c7efd68c2123efc06ab636",
+                "sha256:9e1f353edd7fc7e5e9101abd5bc0201946f77a1b59e0da49095086c03db856ed",
+                "sha256:b3a343dfcbe296dbe0f26c731beee72a792ff948407e6979524298ae7bc3234e",
+                "sha256:d93675af09ca497a25f4f8d62f3313cf0f21e45427a87487049fe84898b99909",
+                "sha256:e2409ef9d37804dfb566f39c962e6ed70f281ff516b8131b3e6b4e6442711ff1",
+                "sha256:f8b653b0f89938ba72e92ab080c2f3aa24c1b72e2f61add22880cd1b9a6e3cdd"
             ],
             "index": "pypi",
-            "version": "==2.2.2"
+            "version": "==2.2.3"
         },
         "mistune": {
             "hashes": [
@@ -382,11 +386,11 @@
         },
         "more-itertools": {
             "hashes": [
-                "sha256:2b6b9893337bfd9166bee6a62c2b0c9fe7735dcf85948b387ec8cba30e85d8e8",
-                "sha256:6703844a52d3588f951883005efcf555e49566a48afd4db4e965d69b883980d3",
-                "sha256:a18d870ef2ffca2b8463c0070ad17b5978056f403fb64e3f15fe62a52db21cc0"
+                "sha256:c187a73da93e7a8acc0001572aebc7e3c69daf7bf6881a2cea10650bd4420092",
+                "sha256:c476b5d3a34e12d40130bc2f935028b5f636df8f372dc2c1c01dc19681b2039e",
+                "sha256:fcbfeaea0be121980e15bc97b3817b5202ca73d0eae185b4550cbfce2a3ebb3d"
             ],
-            "version": "==4.2.0"
+            "version": "==4.3.0"
         },
         "msgpack": {
             "hashes": [
@@ -450,62 +454,62 @@
         },
         "numpy": {
             "hashes": [
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+                "sha256:83b8fc18261b70f45bece2d392537c93dc81eb6c539a16c9ac994c47fc79f09a",
+                "sha256:9473ad28375710ab18378e72b59422399b27e957e9339c413bf00793b4b12df0",
+                "sha256:95b085b253080e5d09f7826f5e27dce067bae813a132023a77b739614a29de6e",
+                "sha256:98b86c62c08c2e5dc98a9c856d4a95329d11b1c6058cb9b5191d5ea6891acd09",
+                "sha256:a3bd01d6d3ed3d7c06d7f9979ba5d68281f15383fafd53b81aa44b9191047cf8",
+                "sha256:c81a6afc1d2531a9ada50b58f8c36197f8418ef3d0611d4c1d7af93fdcda764f",
+                "sha256:ce75ed495a746e3e78cfa22a77096b3bff2eda995616cb7a542047f233091268",
+                "sha256:dae8618c0bcbfcf6cf91350f8abcdd84158323711566a8c5892b5c7f832af76f",
+                "sha256:df0b02c6705c5d1c25cc35c7b5d6b6f9b3b30833f9d178843397ae55ecc2eebb",
+                "sha256:e3660744cda0d94b90141cdd0db9308b958a372cfeee8d7188fdf5ad9108ea82",
+                "sha256:f2362d0ca3e16c37782c1054d7972b8ad2729169567e3f0f4e5dd3cdf85f188e"
             ],
             "index": "pypi",
-            "version": "==1.15.0"
+            "version": "==1.15.1"
         },
         "pandas": {
             "hashes": [
-                "sha256:05ac350f8a35abe6a02054f8cf54e0c048f13423b2acb87d018845afd736f0b4",
-                "sha256:174543cd68eaee60620146b38faaed950071f5665e0a4fa4adfdcfc23d7f7936",
-                "sha256:1a62a237fb7223c11d09daaeaf7d15f234bb836bfaf3d4f85746cdf9b2582f99",
-                "sha256:2c1ed1de5308918a7c6833df6db75a19c416c122921824e306c64a0626b3606c",
-                "sha256:33825ad26ce411d6526f903b3d02c0edf627223af59cf4b5876aa925578eec74",
-                "sha256:4c5f76fce8a4851f65374ea1d95ca24e9439540550e41e556c0879379517a6f5",
-                "sha256:67504a96f72fb4d7f051cfe77b9a7bb0d094c4e2e5a6efb2769eb80f36e6b309",
-                "sha256:683e0cc8c7faececbbc06aa4735709a07abad106099f165730c1015da916adec",
-                "sha256:77cd1b485c6a860b950ab3a85be7b5683eaacbc51cadf096db967886607d2231",
-                "sha256:814f8785f1ab412a7e9b9a8abb81dfe8727ebdeef850ecfaa262c04b1664000f",
-                "sha256:894216edaf7dd0a92623cdad423bbec2a23fc06eb9c85483e21876d1ef8f47e9",
-                "sha256:9331e20a07360b81d8c7b4b50223da387d264151d533a5a5853325800e6631a4",
-                "sha256:9cd3614b4e31a0889388ff1bd19ae857ad52658b33f776065793c293a29cf612",
-                "sha256:9d79e958adcd037eba3debbb66222804171197c0f5cd462315d1356aa72a5a30",
-                "sha256:b90e5d5460f23607310cbd1688a7517c96ce7b284095a48340d249dfc429172e",
-                "sha256:bc80c13ffddc7e269b706ed58002cc4c98cc135c36d827c99fb5ca54ced0eb7a",
-                "sha256:cbb074efb2a5e4956b261a670bfc2126b0ccfbf5b96b6ed021bc8c8cb56cf4a8",
-                "sha256:e8c62ab16feeda84d4732c42b7b67d7a89ad89df7e99efed80ea017bdc472f26",
-                "sha256:ff5ef271805fe877fe0d1337b6b1861113c44c75b9badb595c713a72cd337371"
+                "sha256:11975fad9edbdb55f1a560d96f91830e83e29bed6ad5ebf506abda09818eaf60",
+                "sha256:12e13d127ca1b585dd6f6840d3fe3fa6e46c36a6afe2dbc5cb0b57032c902e31",
+                "sha256:1c87fcb201e1e06f66e23a61a5fea9eeebfe7204a66d99df24600e3f05168051",
+                "sha256:242e9900de758e137304ad4b5663c2eff0d798c2c3b891250bd0bd97144579da",
+                "sha256:26c903d0ae1542890cb9abadb4adcb18f356b14c2df46e4ff657ae640e3ac9e7",
+                "sha256:2e1e88f9d3e5f107b65b59cd29f141995597b035d17cc5537e58142038942e1a",
+                "sha256:31b7a48b344c14691a8e92765d4023f88902ba3e96e2e4d0364d3453cdfd50db",
+                "sha256:4fd07a932b4352f8a8973761ab4e84f965bf81cc750fb38e04f01088ab901cb8",
+                "sha256:5b24ca47acf69222e82530e89111dd9d14f9b970ab2cd3a1c2c78f0c4fbba4f4",
+                "sha256:647b3b916cc8f6aeba240c8171be3ab799c3c1b2ea179a3be0bd2712c4237553",
+                "sha256:66b060946046ca27c0e03e9bec9bba3e0b918bafff84c425ca2cc2e157ce121e",
+                "sha256:6efa9fa6e1434141df8872d0fa4226fc301b17aacf37429193f9d70b426ea28f",
+                "sha256:be4715c9d8367e51dbe6bc6d05e205b1ae234f0dc5465931014aa1c4af44c1ba",
+                "sha256:bea90da782d8e945fccfc958585210d23de374fa9294a9481ed2abcef637ebfc",
+                "sha256:d785fc08d6f4207437e900ffead930a61e634c5e4f980ba6d3dc03c9581748c7",
+                "sha256:de9559287c4fe8da56e8c3878d2374abc19d1ba2b807bfa7553e912a8e5ba87c",
+                "sha256:f4f98b190bb918ac0bc0e3dd2ab74ff3573da9f43106f6dba6385406912ec00f",
+                "sha256:f71f1a7e2d03758f6e957896ed696254e2bc83110ddbc6942018f1a232dd9dad",
+                "sha256:fb944c8f0b0ab5c1f7846c686bc4cdf8cde7224655c12edcd59d5212cd57bec0"
             ],
             "index": "pypi",
-            "version": "==0.23.3"
+            "version": "==0.23.4"
         },
         "pandocfilters": {
             "hashes": [
@@ -537,17 +541,17 @@
         },
         "pluggy": {
             "hashes": [
-                "sha256:7f8ae7f5bdf75671a718d2daf0a64b7885f74510bcd98b1a0bb420eb9a9d0cff",
-                "sha256:d345c8fe681115900d6da8d048ba67c25df42973bda370783cd58826442dcd7c",
-                "sha256:e160a7fcf25762bb60efc7e171d4497ff1d8d2d75a3d0df7a21b76821ecbf5c5"
+                "sha256:6e3836e39f4d36ae72840833db137f7b7d35105079aee6ec4a62d9f80d594dd1",
+                "sha256:95eb8364a4708392bae89035f45341871286a333f749c3141c20573d2b3876e1"
             ],
-            "version": "==0.6.0"
+            "markers": "python_version != '3.3.*' and python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*'",
+            "version": "==0.7.1"
         },
         "prometheus-client": {
             "hashes": [
-                "sha256:69494dc1ac967c0f626c8193e439755c2b95dd4ed22ef31c277601778a50c7ff"
+                "sha256:17bc24c09431644f7c65d7bce9f4237252308070b6395d6d8e87767afe867e24"
             ],
-            "version": "==0.3.0"
+            "version": "==0.3.1"
         },
         "prompt-toolkit": {
             "hashes": [
@@ -562,6 +566,7 @@
                 "sha256:923f299cc5ad920c68f2bc0bc98b75b9f838b93b599941a6b63ddbc2476394c0",
                 "sha256:d7cc528d76e76342423ca640335bd3633420dc1366f258cb31d05e865ef5ca1f"
             ],
+            "markers": "os_name != 'nt'",
             "version": "==0.6.0"
         },
         "py": {
@@ -569,6 +574,7 @@
                 "sha256:3fd59af7435864e1a243790d322d763925431213b6b8529c6ca71081ace3bbf7",
                 "sha256:e31fb2767eb657cbde86c454f02e99cb846d3cd9d61b318525140214fdc0e98e"
             ],
+            "markers": "python_version != '3.3.*' and python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*'",
             "version": "==1.5.4"
         },
         "pydot": {
@@ -596,11 +602,6 @@
         "pyparsing": {
             "hashes": [
                 "sha256:0832bcf47acd283788593e7a0f542407bd9550a55a8a8435214a1960e04bcb04",
-                "sha256:281683241b25fe9b80ec9d66017485f6deff1af5cde372469134b56ca8447a07",
-                "sha256:8f1e18d3fd36c6795bb7e02a39fd05c611ffc2596c1e0d995d34d67630426c18",
-                "sha256:9e8143a3e15c13713506886badd96ca4b579a87fbdf49e550dbfc057d6cb218e",
-                "sha256:b8b3117ed9bdf45e14dcc89345ce638ec7e0e29b2b579fa1ecf32ce45ebac8a5",
-                "sha256:e4d45427c6e20a59bf4f88c639dcc03ce30d193112047f94012102f235853a58",
                 "sha256:fee43f17a9c4087e7ed1605bd6df994c6173c1e977d7ade7b651292fab2bd010"
             ],
             "version": "==2.2.0"
@@ -613,11 +614,11 @@
         },
         "pytest": {
             "hashes": [
-                "sha256:0453c8676c2bee6feb0434748b068d5510273a916295fd61d306c4f22fbfd752",
-                "sha256:4b208614ae6d98195430ad6bde03641c78553acee7c83cec2e85d613c0cd383d"
+                "sha256:2e7c330338b2732ddb992217962e3454aa7290434e75329b1a6739cea41bea6b",
+                "sha256:4abcd98faeea3eb95bd05aa6a7b121d5f89d72e4d36ddb0dcbbfd1ec9f3651d1"
             ],
             "index": "pypi",
-            "version": "==3.6.3"
+            "version": "==3.7.3"
         },
         "pytest-env": {
             "hashes": [
@@ -668,40 +669,41 @@
         },
         "pyzmq": {
             "hashes": [
-                "sha256:096b72e48dc4fb6afac4dc862626b103287176be7c0f49b52782689eac4bf376",
-                "sha256:1c0d469837c54df4b3b8424c79f102a2a4ccc7e1e7f8816fcdcf39c1e6406b19",
-                "sha256:2199f753a230e26aec5238b0518b036780708a4c887d4944519681a920b9dee4",
-                "sha256:22402d2a55dcc5973b1356be12dbc4417350fcc85a6da3af2984271e769a28f4",
-                "sha256:4166c2e45b5d43bc1da49a7f8518c2ced11227fb69b35405940442b92b0b0c34",
-                "sha256:488ab43a9c4a710264987e7efe5d53384858281bd6540db0a47e7bb6c3bf7ec5",
-                "sha256:8d757eaf5eb3b27ab449343e55b8e8f442a3de67ccdfca893cefe8964d44a147",
-                "sha256:8e576262221c7fbee894cf105eb975f1385fc91988ce6120cdb2305195e7a9f6",
-                "sha256:90b38559b33f544ebaa35fcb8d4091cb35c689a3cfe92e584e36c746f648c12b",
-                "sha256:911f457a0b5c0e0c857a71bd2abbb96d15c695a11cf61caa43059143ed01bb6e",
-                "sha256:941c9676bc2f3dbab528a4cd42a9dd80310156ed6014276f16288f25c9ff4da2",
-                "sha256:965d50febc5402e7fb93c432155463b4184a79bec040cdeb3b006b278b3a544f",
-                "sha256:98fe34bbbe5a516e75ac16f1ea585d9c1dda2067b6c9f4da174add6c952883b6",
-                "sha256:9dc60c4a8299aa77082493231045d15b58c7875cb9f3dbee6e11a86356bd9e24",
-                "sha256:a3d1c56387332063a5492c186fb504a7b6dfbdf6f0ce0a7388fed722998e3b0f",
-                "sha256:a9660113ff4c52160f734704af8d351326cc6eabf1dbd135cf02c0ded02e1d9d",
-                "sha256:b097f32a1ee00e0b2aa9776e0112a73655484d2e7c0634757c84c036c8be0706",
-                "sha256:bcd81ab868e916fc22172667e528211b21e2dcab9af2e9fb3ee631d3eb946893",
-                "sha256:bd1c9cbb6d1032a61a8ab0e77b1c83caa7b04e77a6736ff23d213de6bde92622",
-                "sha256:cfe8d245bd62b3f87e120029f5a83f47055d3bb2d2b7f91566dd43487dedd6e3",
-                "sha256:d74052450985befe7d983abb1daab6112b5cb78f1258731afe04c55dbb504739",
-                "sha256:df65629511d6037045b2b4d87b17b0a984d7ae6af44e0d87c350c93e6685d746",
-                "sha256:e724a5117044490cf0f55b5025bba4b909de0be4f47f6a48ad7c24d6a8e7e48c",
-                "sha256:fafcb5be16c0012ada037b8eaf63d5b25d421680072eeb6df4a2d90599d962e6",
-                "sha256:fdced6cf08aaa5b0dacfa4562e518ffb562bb09a90483f920cf6c4ecabd3f379"
-            ],
-            "version": "==17.1.0"
+                "sha256:25a0715c8f69cf72f67cfe5a68a3f3ed391c67c063d2257bec0fe7fc2c7f08f8",
+                "sha256:2bab63759632c6b9e0d5bf19cc63c3b01df267d660e0abcf230cf0afaa966349",
+                "sha256:30ab49d99b24bf0908ebe1cdfa421720bfab6f93174e4883075b7ff38cc555ba",
+                "sha256:32c7ca9fc547a91e3c26fc6080b6982e46e79819e706eb414dd78f635a65d946",
+                "sha256:41219ae72b3cc86d97557fe5b1ef5d1adc1057292ec597b50050874a970a39cf",
+                "sha256:4b8c48a9a13cea8f1f16622f9bd46127108af14cd26150461e3eab71e0de3e46",
+                "sha256:55724997b4a929c0d01b43c95051318e26ddbae23565018e138ae2dc60187e59",
+                "sha256:65f0a4afae59d4fc0aad54a917ab599162613a761b760ba167d66cc646ac3786",
+                "sha256:6f88591a8b246f5c285ee6ce5c1bf4f6bd8464b7f090b1333a446b6240a68d40",
+                "sha256:75022a4c60dcd8765bb9ca32f6de75a0ec83b0d96e0309dc479f4c7b21f26cb7",
+                "sha256:76ea493bfab18dcb090d825f3662b5612e2def73dffc196d51a5194b0294a81d",
+                "sha256:7b60c045b80709e4e3c085bab9b691e71761b44c2b42dbb047b8b498e7bc16b3",
+                "sha256:8e6af2f736734aef8ed6f278f9f552ec7f37b1a6b98e59b887484a840757f67d",
+                "sha256:9ac2298e486524331e26390eac14e4627effd3f8e001d4266ed9d8f1d2d31cce",
+                "sha256:9ba650f493a9bc1f24feca1d90fce0e5dd41088a252ac9840131dfbdbf3815ca",
+                "sha256:a02a4a385e394e46012dc83d2e8fd6523f039bb52997c1c34a2e0dd49ed839c1",
+                "sha256:a3ceee84114d9f5711fa0f4db9c652af0e4636c89eabc9b7f03a3882569dd1ed",
+                "sha256:a72b82ac1910f2cf61a49139f4974f994984475f771b0faa730839607eeedddf",
+                "sha256:ab136ac51027e7c484c53138a0fab4a8a51e80d05162eb7b1585583bcfdbad27",
+                "sha256:c095b224300bcac61e6c445e27f9046981b1ac20d891b2f1714da89d34c637c8",
+                "sha256:c5cc52d16c06dc2521340d69adda78a8e1031705924e103c0eb8fc8af861d810",
+                "sha256:d612e9833a89e8177f8c1dc68d7b4ff98d3186cd331acd616b01bbdab67d3a7b",
+                "sha256:e828376a23c66c6fe90dcea24b4b72cd774f555a6ee94081670872918df87a19",
+                "sha256:e9767c7ab2eb552796440168d5c6e23a99ecaade08dda16266d43ad461730192",
+                "sha256:ebf8b800d42d217e4710d1582b0c8bff20cdcb4faad7c7213e52644034300924"
+            ],
+            "markers": "python_version >= '2.7' and python_version != '3.1*' and python_version != '3.2*' and python_version != '3.0*'",
+            "version": "==17.1.2"
         },
         "qtconsole": {
             "hashes": [
-                "sha256:b3d10314cbaad76c3157cf922eb410812cde472e8e7c6bd3d5a92d30145bcde1",
-                "sha256:eff8c2faeda567a0bef5781f419a64e9977988db101652b312b9d74ec0a5109c"
+                "sha256:298431d376d71a02eb1a04fe6e72dd4beb82b83423d58b17d532e0af838e62fa",
+                "sha256:7870b19e6a6b0ab3acc09ee65463c0ca7568b3a01a6902d7c4e1ed2c4fc4e176"
             ],
-            "version": "==4.3.1"
+            "version": "==4.4.1"
         },
         "redis": {
             "hashes": [
@@ -812,16 +814,17 @@
         },
         "sqlalchemy": {
             "hashes": [
-                "sha256:72325e67fb85f6e9ad304c603d83626d1df684fdf0c7ab1f0352e71feeab69d8"
+                "sha256:ef6569ad403520ee13e180e1bfd6ed71a0254192a934ec1dbd3dbf48f4aa9524"
             ],
             "index": "pypi",
-            "version": "==1.2.10"
+            "version": "==1.2.11"
         },
         "terminado": {
             "hashes": [
                 "sha256:55abf9ade563b8f9be1f34e4233c7b7bde726059947a593322e8a553cc4c067a",
                 "sha256:65011551baff97f5414c67018e908110693143cfbaeb16831b743fe7cad8b927"
             ],
+            "markers": "python_version != '3.3.*' and python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*'",
             "version": "==0.8.1"
         },
         "testpath": {
@@ -849,15 +852,16 @@
                 "sha256:c58757e37c4a3172949c99099d4d5106e4d7b63aa0617f9bb24bfbff712c7866",
                 "sha256:d8984742ce86c0855cccecd5c6f54a9f7532c983947cff06f3a0e2115b47f85c"
             ],
+            "markers": "python_version != '3.3.*' and python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*'",
             "version": "==5.1"
         },
         "tqdm": {
             "hashes": [
-                "sha256:536e5a0205b6401d8aaf04b21469949c178dbe3642e3c76d3bb494a83cb22a10",
-                "sha256:60bbaa6700e87a250f6abcbbd7ddb33243ad592240ba46afce5305b15b406fad"
+                "sha256:5ef526702c0d265d5a960a3b27f3971fac13c26cf0fb819294bfa71fc6026c88",
+                "sha256:a3364bd83ce4777320b862e3c8a93d7da91e20a95f06ef79bed7dd71c654cafa"
             ],
             "index": "pypi",
-            "version": "==4.24.0"
+            "version": "==4.25.0"
         },
         "traitlets": {
             "hashes": [
@@ -896,10 +900,10 @@
         },
         "widgetsnbextension": {
             "hashes": [
-                "sha256:af7412053b646a5372278bf772714543acdd6e0ad87f18171ba6a0c9009e3114",
-                "sha256:c5280a62d293735cdadc7b8884e2affcfb0488420ee09963577f042359726392"
+                "sha256:7e8fc9688d4fb68c96537ce00604cf8d3bbf48bd348f2c4dfb91174c308b1e10",
+                "sha256:c9d6e426a1d79d132b57b93b368feba2c66eb7b0fd34bdb901716b4b88e94497"
             ],
-            "version": "==3.3.0"
+            "version": "==3.4.0"
         },
         "wordfreq": {
             "hashes": [
diff --git a/tasks.py b/tasks.py
index 8cd3290..16a1cec 100644
--- a/tasks.py
+++ b/tasks.py
@@ -16,28 +16,28 @@
 
 
 @task
-def create_db(ctx):
+def create_db(c):
     """Create all tables.
     """
     BaseModel.metadata.create_all(engine)
 
 
 @task
-def drop_db(ctx):
+def drop_db(c):
     """Drop all tables.
     """
     BaseModel.metadata.drop_all(engine)
 
 
 @task(drop_db, create_db)
-def reset_db(ctx):
+def reset_db(c):
     """Drop + create tables.
     """
     pass
 
 
 @task(reset_db)
-def load_db(ctx):
+def load_db(c):
     """Load SQLite tables.
     """
     logger.info('Loading regions.')
@@ -51,7 +51,7 @@ def load_db(ctx):
 
 
 @task
-def clean_db(ctx):
+def clean_db(c):
     """Database post-processing.
     """
     logger.info('Cleaning localities.')
@@ -59,7 +59,7 @@ def clean_db(ctx):
 
 
 @task
-def build_indexes(ctx):
+def build_indexes(c):
     """Build dist indexes.
     """
     logger.info('Indexing states.')
@@ -74,15 +74,15 @@ def build_indexes(ctx):
 
 
 @task(build_indexes)
-def test(ctx):
+def test(c):
     """Run test suite.
     """
-    call(['pytest', 'tests/test_db'])
-    call(['pytest', 'tests/prod_db'])
+    c.run('pytest tests/test_db')
+    c.run('pytest tests/prod_db')
 
 
 @task(load_db, clean_db, build_indexes, test)
-def build(ctx):
+def build(c):
     """Load SQLite, build indexes, test.
     """
     pass