* working version
* fix text
* combine test files
* move private funcs to bottom
* ErrInvalidType should ignore interfaces
* replace MarshalOnePayload w/ MarshalPayload; fix bug w/ node merge()
* minor tweaks; address a couple comments
* decompose unmarshalNode() to smaller funcs; unmarshal should go from top-level to embedded
* deep copy the node when passing relation/sideloaded notes to unmarshal()
* add some comments and do some additional cleanup
* add test uses annotationIgnore
* implement support for struct fields that implement json.Marshaler/Unmarshaler
* add additional test that compares marshal/unmarshal behavior w/ standard json library
* add support for pointer embedded structs
* Revert "implement support for struct fields that implement json.Marshaler/Unmarshaler"
This reverts commit deeffb78df.
* Add support to nullify relationship; http://jsonapi.org/format/#document-resource-object-linkage
* Fixed: [null] is not valid as an empty relationship.
* add support for 'omitempty' on relationships; default behavior of marshalling empty/nil relations (i.e. w/o 'omitempty' tag) marshals with null data relation
* cleanup whitespace
* Added go 1.7 to test versions; fixed the marshaling of empty relations to return an empty array rather than a null/nil. Added a more robust test case for the marshaling of non omitted relations.
* Cleanup.
* Added a comment to UnmarshalMany
* Document the ‘omitempty’ annotation on a relation.
* Add common JSON API values as exported jsonapi pkg constants.