Update Readme unit test section
Implement extractHasMany and extractBelongsTo
Merge pull request #718 from tchak/fixture-adapter-cleanup

Implement extractHasMany and extractBelongsTo on FixtureAdapter
Introduce a custom `keyForHasMany()` for `DS.RESTSerializer`.

This method returns the singularized key appended with `_ids`. It uses the same plurals hash on the serializer to determine singular versions of keys.

Fixes #710
Merge pull request #713 from bradfol/readme-tests

Update Readme Unit Test section
Merge pull request #727 from dgeb/rest-adapter-has-many-ids

Introduce a custom `keyForHasMany()` for `DS.RESTSerializer`.
Merge branch 'master' into date-fix