Merged changes from the seam-gui branch. Disabled belay integration and tests as well.
Fixed a bug in the REST Version Interceptor that was blocking more than it should have. Fixed a problem that allowed entities to be
updated from almost any endpoint. Added ExceptionMappers to make certain REST errors to return as plain text. Refactored code to work with Model changes.
Fixed bugs and added text field for Content Spec entities.
Merge pull request #5 from lnewson/devel

Updates from the SEAM GUI and Content Spec database changes.