Added basic WAILA compatibility

I got bored, so I made you this.

![](http://i.imgur.com/7hDRKt5.png)

Couple quick notes about this, in case you're unaware. Any files in the /api directory are compiled against, but not packaged up with the resulting build. Since the WAILA provider is *never* directly accessed from the mod, but only through WAILA, it simply won't be loaded if WAILA doesn't exist, so there shouldn't be any issues with the API missing.