Client id merged from https://github.com/tstirrat/ember-data/tree/embedded-client-id
Try to distribute
Add '_attributes'
Support for ids deserialization
README update
Destroy support
Is Deleted in place of isDestroyed
Unload properlly
Support inFlightAttributes
Fixed double call to 'embedded record'.adapterDidCommit in EmbeddedRecordsMixin.
Merge branch 'embedded-client-id' into embedded-relation-save