Added a basis Event RDF Datastream
Adding spec tests for premis datastream
Adding premis datastream and tests.
Added fileManifest Datastream to bag.
Fleshed out bagManifestDatastream tests
Added rake task to read bag data from S3.
Merge branch 'feature/bagmodels' into develop

# By Streamweaver
# Via Streamweaver
* feature/bagmodels:
  Added rake task to read bag data from S3.
  Fleshed out bagManifestDatastream tests
  Added fileManifest Datastream to bag.
  Adding premis datastream and tests.
  Adding spec tests for premis datastream
  Added a basis Event RDF Datastream

Conflicts:
	Gemfile.lock