v0.11.0

A lot of new, big things!

• Game is now playable.
  • Only 1 player and 7k+1 mode.
  • Speed, keyboard mapping, and audio latency is still hardcoded.
  • BMS url configurable via ?bms query parameter.
• Isparta is used to perform code coverage instrumentation.
• Documentation is revamped to Sphinx style, and is published to http://bemuse.readthedocs.org/.