Partial.
An ugly implementation of the relationship creation and deletion.
Refactoring the RelateBodyParser.
Using the base ConflictException instead of EntityConflictExceptionInterface - creating a problem.
Fixing a bug.
We can now delete relationships.
Fixed a bug in the ResourceCollectionFactory.
Catching the conflict exceptions to report 409 statuses.
Parsing the relationship Ids sent when deleting.
Improving an error message.
Merge remote-tracking branch 'origin/develop' into feature/api-59-to-one-urls
Merge remote-tracking branch 'origin/master' into feature/api-59-to-one-urls
Adding 409 to the API test case.
Merge pull request #39 from GoIntegro/feature/api-59-to-one-urls

[API-59] To one relationship URLs