The order of arguments to normalize have changed.

In https://github.com/emberjs/data/commit/84c2bfe035f6ab830f4e111c5a9a803967f112a0
the order of arguments to normalize have changed. The TRANSITION.md
document should reflect this in order to ease transitioning.
Return values need to be updated as well.
Merge pull request #1224 from halogenandtoast/mm-transition-changes

The order of arguments to normalize have changed.