Add an example of sending cookie information in the header and updated confusing reopen example.
Remove unnessary loop in extracting single using DS.EmbeddedRecordsMixin

- updatePayloadWithEmbeddedBelongsTo: removed unnessary loop
Merge pull request #1962 from pixelhandler/updatePayloadWithEmbeddedBelongsTo

Remove unnessary loop in extracting single using DS.EmbeddedRecordsMixin
JSONSerializer should use the attrs hash when extracting records
Also breaks the _super chain in normalize to preserve ordering in the RESTSerializer
Merge pull request #1650 from bmac/json-serializer-attrs

JSONSerializer should use the attrs hash when extracting records
moved normalizeId to JSONSerializer
Merge pull request #1964 from bmac/normalizeId

moved normalizeId to JSONSerializer
Merge pull request #1827 from bmac/more-header-docs

Add an example of sending cookie information in the header and updated...
Add a doc heading for the ActiveModelSerializer class to so its page shows up in the API docs
Merge pull request #1965 from bmac/active-model-serializer-doc

Add a doc heading for the ActiveModelSerializer class to so its page sho...