fix issue with incorrect task id being returned for celery tasks
entries werent being deleted from dynamodb table because aws keys were not being picked up
fix issue with how executables are called when running on the cloud
fix issue with how compute nodes set stochkit_home env var
fix issue with failed cloud jobs never being recognized as failed
Merge pull request #87 from StochSS/bug_fixes

In the interest of getting these fixes back into develop, I am merging this myself.