Merge release back to master.

Upgrade RequireJS

Revert "ziafazal/WL-328: Multi-Site Comprehensive Theming"

Accessibility fixes for the course home page.

FEDX-105

Release Candidate rc/2016-03-16

Use is-hidden instead of hidden for video errors.

Revert ECOM-2947.

This reverts commit 954dae58.

This reverts commit 178f5a60.

Added visible_to_staff_only field to course blocks API

Reverted rfc6266 change

The fork actually does include a commit that is not in the PyPI version.

ECOM-3833

render progress status while problem content rendering

Email address with '+' is accepted by Student Support.

Bump the version of the Drag&Drop XBlock to 2.0.4.

Ziafazal/wl-328 multi-tenancy support in Comprehensive Theming

ziafazal: improvements need for multi-tenancy
ziafazal: fixed broken tests
ziafazal: no need to add setting in test.py
ziafazal: added hostname validation
ziafazal: changes after feedback from mattdrayer
ziafazal: fixed branding and microsite broken tests
ziafazal: make STATICFILES_DIRS to list
ziafazal: added theme directory to mako lookup for tests
ziafazal: added more protection in test_util
saleem-latif: Enable SCSS Overrides for Comprehensive Theming
saleem-latif: Incoporate feedback changes, Correct test failures, add tests and enable theming for django templates
saleem-latif: Correct errors in python tests
mattdrayer: Fix invalid release reference
mattdrayer: Update django-wiki reference to latest release

Flaky Matlab Tests

Flaky Discussion Tests

Properly escape mixed content. text + html.

TNL-4243

Ajax callbacks are used in a lot of places in discussions; our tests
need to wait for those callbacks to finish in several places.

Flagging other library import bok-choy test as flaky.

New optional parameters for course blocks API: lti_url, block_types_filter

Flag two tests as flaky. See inline comments for JIRA tickets.

Move any uncached JS to be cached

mattdrayer/xblock-translations: I18N/L10N for XBlocks

* mattdrayer:  Latest proto code
* mattdrayer:  Add translation.py
* asadiqbal08: Xblock translation ugettext update, remove translation.py
* mattdrayer:  Additional I18N work -- starting to see some translations!
* asadiqbal08: Trying to make xBlock message catalog files path dynamic
* mattdrayer:  Remove unnecessary modifications
* mattdrayer:  Cleaned up implementation
* mattdrayer:  Moved import statement
* asadiqbal08: update as suggested
* asadiqbal08: xblock its own domain
* asadiqbal08: translation: secure none object
* asadiqbal08: pylint
* asadiqbal08: get locale from xblock
* asadiqbal08: update
* mattdrayer:  Determine XBlock locale path within runtime service
* mattdrayer:  Determine module location via the runtime
* mattdrayer:  Remove ModuleI18nService reference
* asadiqbal08: override the service in studio
* asadiqbal08: remove import
* asadiqbal08: update the Modulei18nService
* asadiqbal08: update the Modulei18nService
* mattdrayer:  Remove redundant __class__ reference
* asadiqbal08: update the docstring
* asadiqbal08: tests
* mattdrayer:  Remove specific ugettext override from ModuleI18nService
* mattdrayer:  Move service operation to base class
* mattdrayer:  Address quality violations
* asadiqbal08: Investigating the test failure issue on jenkins and solved
* asadiqbal08: First utilizing the parent class method
* mattdrayer:  Use recommended callable approach
* asadiqbal08: remove unused code
* asadiqbal08: Updated the test to use cms preview module system runtime in order to get i18n service.
* asadiqbal08: Pylint quality
* asadiqbal08: update the service call to check xblock declarations
* asadiqbal08: update doc string
* asadiqbal08: i18n callable test in studio
* asadiqbal08: test lms runtime for modulei18n service
* asadiqbal08: add doc strings
* asadiqbal08: Rename locale and domain to Flask-Babel convention

Replaced Git requirements with PyPI

ECOM-3799