Improve functionality for newer lean versions #39
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This removes the bundled lean servers in favor of downloading newer versions directly from github. Alternatively, the user may also explicitly specify a folder from which to get the lean server (if they wish to use a custom build for example).
Also, this removes compression from the library zipfile when building in devmode. This is done because newer versions of mathlib are quite large and compression takes a long time (on my machine this reduced build times from around 4 minutes to just 45 seconds). Since devmode will usually be for local development using the loopback device for networking, the bandwidth will be quite large and the larger file size shouldn't cause problems (you'll save more time from reduced build times than you'll waste waiting for the network).