Added pretty-printed JSON examples for DOC-168, fixed rst subheadings

Fixes LMS-2352 by unifying :hover and :focus styles.

Valera/add timeout china

The availability of the YouTube API will be stored in student's settings.
The YouTube API is loaded asynchronously now, so no need to pass a
parameter to the front-end telling it if YouTube API should not be loaded
because of it's unavailability.

Removing loading of YouTube API from Studio RequireJS config. Now loading
of YouTube API is handled by Video module.

BLD-531.

Instructor dash changes for DOC-231, resequencing for DOC-230

Video: update acceptance test.

Fixed "ugettext" is imported as "_u" in lagacy dash.

LMS-2307

Release Notes for 3-18-14

mentoring-noworkbench: Remove import of workbench module (moved to SDK)

Video: Fix flaky acceptance test.

Kill the perfstats module, which is unused

Sarina/lms 1287

Mongo modulestore: create data dir

Make i18n tests quieter

We already have makedirs_p()

LMS-1287

LMS-1287

in create_user mgmt command, use settings.LANGUAGE_CODE instead of en-us

Fix split_test import and export.

Fixes the create_user admin command, which was creating user accounts
with a potentially invalid language preference.

JIRA: FOR-532

Add method to clear mako template lookups

LMS-2405

Ensure account creation succeeds before creating comments service user

Do not allow students to pin/unpin forum threads

Also improves handling in cases where account creation did succeed, but
comments service user creation did not.

Depends on commit 88abdd8a0b20bc9816f487b25abdea1953f5661d in https://github.com/edx/cs_comments_service

JIRA: FOR-522

refactor static tab tests