edx/edx-ora2 — pull request #366 by wedaly (2014-05-28 11:04:42+00:00)
Title: Will/ai grading s3 bucket prefix

[TIM-592](https://edx-wiki.atlassian.net/browse/TIM-592): Support S3 Bucket Path Prefixes

@stephensanchez Please review
@feanil FYI, the Django setting is `ORA2_FILE_PREFIX`