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

We had a mechanism to, at runtime, generate a RequireJS config that
would override the base paths and, instead, use the hashed versions of
assets for things that RequireJs was loading on demand.

We've now moved that out of the coureware.html base template and into
main.html so that more pages actually benefit from it.

As well, we've added some of the heavy hitters for unhashed assets,
namely moment.min.js, to these overrides which should allow better
caching for end users.  We'll be able to add more things to the override
list in the future as they crop up.

Update translations (autogenerated message)

Each of the replaced commits can be sourced from PyPI rather than Git. Also, django-pipeline does not need to be editable.

ECOM-3833

Always uninstall python packages on the uninstall list 

Fix for ORA delete state TNL-4152

Improve accessibility for dashboard course settings dropdown

Upgrade to Django 1.8.11.

clear_student_state(), a method defined by ORA, requires information
about the user making the request. Since this xblock is not bound,
we must provide that information explicitly.

WIP: Asynchronous download button for ORA2 data

XBlockAside improvement. Difficulty selectbox in Studio (based on new XBlockAside functionality)

Hotfix for March 9, 2016.

Conflicts:
	lms/djangoapps/instructor/tests/test_api.py
	lms/djangoapps/instructor/utils.py
	lms/djangoapps/instructor/views/api.py
	lms/djangoapps/instructor/views/api_urls.py
	lms/djangoapps/instructor/views/instructor_dashboard.py
	lms/djangoapps/instructor_task/api.py
	lms/djangoapps/instructor_task/tasks.py
	lms/djangoapps/instructor_task/tasks_helper.py
	lms/djangoapps/instructor_task/tests/test_api.py
	lms/djangoapps/instructor_task/tests/test_tasks.py
	lms/djangoapps/instructor_task/tests/test_tasks_helper.py
	lms/envs/aws.py
	lms/envs/common.py
	lms/static/coffee/src/instructor_dashboard/data_download.coffee
	lms/templates/instructor/instructor_dashboard_2/data_download.html

Remove course about 'Overview' link/tab.

Notes pagination

SOL-1653 SOL-1691 Upgrading edx-proctoring requirement to 0.12.13

return course end date in credit service and rename flag

It looks like in the past there used to be several tabs on the
course about page, but the other tabs have been commented
out years ago.

Having a single tab is pointless and confusing, so remove it.

SOL-1654 / Testing flakiness

Sstudent/ma 2103

Integration CourseTalk widgets with OpenEdx.

Redirect to otto checkout for prof ed courses if enabled

Move tests to one test class

Prevent ordering closed courses, and give a good user message.