added docs that show how to wire up a custom serializer
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.
Make record.toJSON() work
Merge pull request #1213 from toranb/master

added docs that show how to wire up a custom serializer
Language about subclassing a defaultSerializer
Normalize relationships in commit payloads
Store#push not Store#load
rootForType -> pathForType
Add serializer#serializeIntoHash hook
Creating a record that has a belongsTo association
overwrites the association with the owner's ID
Merge pull request #1230 from bradleypriest/serializeData

Add a Serialize#serializeData hook
Merge pull request #1220 from bradleypriest/belongsto-bug

createRecord bug
Clean up last remnants of the old belongsTo in docs
Merge pull request #1231 from bradleypriest/docs

Clean up last remnants of the old belongsTo in docs
Register ED version with Ember.
Merge pull request #1232 from gunn/master

Register ED version with Ember.
Records that could not be found can be retried

Fixes #1235
Fixed typo in doc comments: @property instead of @param