Renamed test_workflow.py (functional test) to prevent auto-execution when running unittest discover
Implemented "/images/IMAGE_ID/checksum" endpoint in order to set the layer checksum at different stage of the image upload
fix update_index_images
Merge pull request #20 from ooyala/master

Fixed an issue with update_index_images
Bumped version to 0.5.2
Implemented tarsum checksum type
Added missing module checksums
Fixed tarsum when the file content does not exist
Fixed tarsum when the file content does not exist