Docs for DS namespace
Merge pull request #927 from thomasboyt/namespace-doc

Docs for DS namespace
reference should not be a reserved attribute name
Merge pull request #929 from tchak/reference

reference should not be a reserved attribute name
Clean up relationship invariant maintenance tests
Make BasicAdapter test more resilient to failure
Correct association in embedded save test
Materialize record before triggering hooks

This resolve #405.
Merge pull request #709 from ghempton/sideload-embedded

Fix for loading embedded records who's parents are sideloaded
Refactor serializer to not be coupled to the store.