The major change is a move back to Sprockets 2.0.3 from a problematic Sprockets 2.1.0.

what was wrong with 2.1.0?

The bug:

3.1.2 Asset pipeline not recognizing file changes in @import 'ed files https://github.com/rails/rails/issues/3686

This is broken in 2.0.3 too. You have to //= depend_on after every @import. It's retarded but you get used to it :P

Using "~> 2.0.3" dependency for sprockets is bullshit. 2.1.0 fixes some key caching issues. Why not allow >= 2.0.3?

I've learned not to use rails asset pipeline. Jammit & barista work well for me.