Dependency warning message on requirements files
Keep comments in capa XML from causing failures

Comments (and processing instructions!) are handled oddly in lxml.
This change will keep them from causing failures.  They will be omitted
from the HTML generated, which is fine, since they aren't needed there.
A test that our XML-comments fix works.
Check extension rather than mimetype
Merge pull request #819 from edx/jkarni/hotfix/gzip-mimetype

Check extension rather than mimetype
Merge pull request #816 from edx/hotfix/xml-parsing

Hotfix/xml parsing
Add support for multiple file uploads
review fixes
Updated acceptance tests to match new behavior in video captions.
Add link in lms legacy instructor dashboard to cms course_index

A one-click way of getting to editing the course
fix capa optioninput template to honor inline flag
Skip acceptance test DB migrations if the DB already exists and running fasttest_acceptance
Merge pull request #836 from edx/will/fix-video-caption-tests

Updated acceptance tests to match new behavior in video captions.
Add acceptance tests for multiple files
Incremented diff cover version to fix 100% coverage bug.
Merge pull request #847 from edx/will/fix-diff-cover

Incremented diff cover version to fix 100% coverage bug.
add pyparsing explicitly to sandbox requirements
add pyparsing to edx requirements
Fix for acceptance test static file issue
Fix multiple video bug