- fix dangling 'level' after recent refactor (now @channel.level)
- fix a bug in the monkeypatching again
- sass has some stuff at the toplevel it needs
- 'jar index' isn't actually something anyone appears to use. It just
  creates a file /META-INF/INDEX.LIST with a list of files in the jar.
  Doesn't actually improve anything, and just slows down the build.
- don't build for java 5
- downgrade cabin due to conflicts (jls-grok wants 0.5.0) and the fact
  that I don't need the Channel#pipe feature yet (only feature in 0.6.0)