Move all lms image files into lms/static/images [OPEN-303]

Implement course-wide asset paging methods.

Unit Test Improvements

Remove documentation files moved to edx-documentation repo

Readme for documentation directory

sort order, etc.
https://openedx.atlassian.net/browse/PLAT-74

Fix track selection tests

Fixed spacing of RTL icon in discussion

Reduce complexity in run_quality.

Fix track selection header copy

Add tests for copying all asset metadata.
https://openedx.atlassian.net/browse/PLAT-74

Add SortedCollection class to help sort lists efficiently.
https://openedx.atlassian.net/browse/PLAT-74

Remove admin files deprecated in Django 1.4

Abstract asset methods into own interface class

Remove more pep8 violations

Implement shim for mobile video events.

Update translations '

then impl the read ones as NotImplementedError placeholders on xml modulestore
PLAT-70

(autogenerated message)

This PR addresses the following issues:

1) All requests return a 200 OK unless there is an authorization failure. This is deliberate in case the secret key is compromised.
2) Push all of the nasty logic necessary to generate compatible video events into the LMS instead of trying to do that mapping on the mobile devices.
3) Stop using the deprecated "action" field in the segment.io event. According to their support team this field should not be used anymore and is just around for backwards compatibility reasons.

Fixes: AN-3818

Studio: Removing older/deprecated style rules

fix click event for actual target

Updates to Demographics Display

TNL-138

Delete lms/static/admin resources as they are no longer needed
for the admin page as of Django 1.4

Moved two files that were referenced elsewhere:
lms/static/admin/js/jquery.min.js -> lms/static/js/admin/jquery.min.js
lms/static/admin/js/urlify.js -> lms/static/js/admin/urlify.js

Ignore errors during cleanup of course export command.

Add warning about sensitive info in course export