Fix support for custom root in JSON-API adapter
Renamed embed test to have "test" suffix
Fixed reference to association options
Merge pull request #689 from ride/fix-json-api-custom-root

Fix support for custom root in JSON-API adapter
Merge pull request #691 from jacob-s-son/fix-embed-option-for-associations

Fix embed option for associations
Handle correctly null associations

null belongs_to associations are now serialized as nil instead
of raise an error during serialization.
Merge pull request #708 from ride/fix-for-nil-associations

Handle correctly null associations
Add type when association name is different than objects type
Merge pull request #709 from ride/add-type

Add type key when association name is different than object type
JSON-API: Don't include linked section if associations are empty
Fixes rbx gems bundling on TravisCI
Merge pull request #711 from rails-api/fixes-rbx-on-travis

Fixes rbx gems bundling on TravisCI
Merge pull request #710 from ride/fix-empty-linked

JSON-API: Don't include linked section if associations are empty
Include 'linked' member for json-api collections

The options passed to the render are partitioned into adapter options
and serializer options. 'include' and 'root' are sent to the adapter,
not sure what options would go directly to serializer, but leaving this
in until I understand that better.
Define as_json instead of to_json
Merge pull request #714 from ride/to-json-as-json

Define as_json instead of to_json
Merge pull request #692 from ggordon/linked_for_jsonapi_collection

Include 'linked' member for json-api collections
Explicitly set serializer for associations

Document specifying serializer for assocaition