Added commented-out Accounting{Max,Start} + explanation

This helps prevent users from going over their monthly transfer allotment with
their server provider.

Defaults to 32GB/day, since 1 TB transfer is a common minimum (e.g., Digital
Ocean) and 1 TB per month/31 days per month max == 32.258 GB transfer/day

Finishes #17

bootstrap.sh

@@ -110,7 +110,9 @@ echo ""
 echo "== Edit /etc/tor/torrc"
 echo "  - Set Address, Nickname, Contact Info, and MyFamily for your Tor relay"
 echo "  - Optional: include a Bitcoin address in the 'ContactInfo' line"
-echo "  - This will enable you to receive donations from OnionTip.com"
+echo "    - This will enable you to receive donations from OnionTip.com"
+echo "  - Optional: limit the amount of data transferred by your Tor relay (to avoid additional hosting costs)"
+echo "    - Uncomment the lines beginning with '#AccountingMax' and '#AccountingStart'"
 echo ""
 echo "== Register your new Tor relay at Tor Weather (https://weather.torproject.org/)"
 echo "   to get automatic emails about its status"

etc/tor/torrc

@@ -16,6 +16,8 @@ DirPort 9030
 
 RelayBandwidthRate 30 MBytes
 RelayBandwidthBurst 100 MBytes
+#AccountingMax 32 GB
+#AccountingStart day 00:00
 
 SocksPort 0
 SocksPolicy reject *