Updated and expanded image status and error handling.
Added job fault support to the API layer
Remove references to "job faults"
Cleanup - addressing PR comments
Merge pull request #60 from esheffield/worker

Updated and expanded image status and error handling.
Merge pull request #61 from esheffield/job-faults

Added job fault support to the API layer
Remove the need for a worker name when registering a worker.
Merge pull request #64 from ameade/worker-name-remove

Remove the need for a worker name when registering a worker.
Add copyright line to python files
Merge pull request #65 from ameade/copyright

Add copyright line to python files