Implement preprocessors for CSS
Cleanup css preprocessors
Implement template preprocessors
Add support for CoffeeScript and sweetjs
Remove Brocfile from blueprint

Now that we have internal support for preprocessors, we can remove the
Brocfile from the generated build, thus addressing #75 & #96. As people
try it out and open issues for things they wish were more configurable,
I think we'll start to get a better idea for what we need to include.
Test fixin