MA-879 Fix bug in course_start_datetime_text

Release merge 06-24-2015

mattdrayer/SOL-449: Add flaky decorator to bok choy test

Moving xblock_user_state to edx-user-state-client, and add dependency to edx-platform

Update Bok Choy to run against optimized static files

Reverification flow asks for permission to use the webcam twice

TNL-2386

TNL-2465

Update URL when switching between Team tabs.

In-course Reverification checkpoint ask for the camera access twice on
Chrome.

ECOM-1739

Update credit eligibility

* Update credit eligibility when a user satisfies an eligibility requirement.
* Refactor set_credit_requirement_status arguments.
* Use django-simple-history to track requirement status changes.
* Refactor progress page by moving credit into a helper function and adding comments.

Move forgot_password_modal to login.html.

Delete LMS JS files that have no references to them.

Fix flaky teams test

split common/lib and js unit tests into separate shards

Fix misleading enrollment API documentation & fix pylint errors

TNL-2494

Credit Eligibility display on the CMS accessibility issues

The user parameter corresponds to the username, not the user ID.

That is the only place using it.

There were some accessibility issues on the cms side which are addressed

ECOM-1594

Aamir khan/ecom 1524 dashboard credit display new

Updated styling for basic capa problems (multiple choice, dropdown, checkboxes, numerical input and text input) including support for mobile app experience. 

Hotfix for performance of course structures

use default cache for tests
add test for when cache isn't configured
add test for dummy cache
noop if no cache found

This is primarily to reduce load on MongoDB, where we've lately
had performance problems that we suspect are caused by very
large course structures being evicted from MongoDB's cache. This
may potentially give us a path to better performance as well,
but that's not the goal of this commit.

Surprisingly, LZ4 seemed to actually run more slowly than zlib
for this. Possibly because of some overhead in the Python
bindings? GZip was also surprisingly slow given that it uses
zlib underneath (something like 5x slower).

Use separate cache backend for caching structures.

Abstract out course structure cache.

add datadog metrics for compressed course structure sizes

Since we're using a different cache background, we don't need to have a cache prefix

Use dummy cache backend for tests.

Fallback to default cache if course_structure_cache doesn't exist.

Add abuse flagging to discussion API

Flagging/unflagging is done by issuing a PATCH request on a thread or
comment endpoint with the "abuse_flagged" field set.

don't use hardcoded date in verification email test