Actually push json parsing all the way down to the bottom of the GradingService get and post methods

Add in metric tracking to xqueue.

Added comment to getUserMedia call in photocapture.js

Doc: update xblock publish() function signature

Update captions logic on front-end.

Changed wording for setting up ORA question.

ORA-351

Covers external grading and certificates.

Watch for asset changes.

Adam/merge release to master

Added note about pages being publicly viewable

Conflicts:
	requirements/edx/edx-private.txt

Upgrade JSdraw input.

Translation fix in studio: For better translation in unit.html

Make paver respect NO_PREREQ_INSTALL

As the sentence in unit.html is splitted into three parts due to the varible release_date may be None, it breaks the integrity of a sentence.
Different language may have different word or event grammer order, so if a sentence is breaked into three parts, translators cannot adjust the word orders to create a good translation.
So this fix tries to combine the sentence together.

Fix the chinese name of chinese language in common.py

Update translations (autogenerated message)

Update reference to the xblock-mentoring repo for optimized dataexport

Update course_about.html

This reverts commit b4ba04ba.

This reverts commit 1ed167d9.

Alex/multiple transcripts editor

Fix donwload subs for non youtube videos and non-en language - continue.
Add acceptance tests.
Add detetion of assets on request.
Updated docstring.
Add fixes and acceptance tests.
Fix acceptance tests.
Update docsrtings and cleanup code, resful for language_id.
Specify exception type in POST.
Fix url in upload module.
Improve exception handling.
Remove 'en' and catching in editable_metadata.
Move descriptor.get_context test to lms tests.
Add query parameter to translation dispatch.
Response to format parameter of translatin GET request.
Fix Acceprance test: Metadata Editor.
move handlers to proper scores.
Split video player into smaller files.
Add ugettext and fix typoes.
Add changelog.
Support for downloading non-ascii filenames.
Change event binding.
Add content-language to download requests.
Reractor POST handler to not update self.transcripts.