Add scoped settings

Adds editor settings for each grammar.

![screen shot 2014-10-20 at 1 12 22 pm](https://cloud.githubusercontent.com/assets/671378/4708241/72a4a678-5895-11e4-9872-a4d7f31588ae.png)

/cc @benogle 

Fixes #264 
Can use the new fancy https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith