Remove autoplay for video in course about page

The iframe was generated with autoplay=1, which, sometimes, would cause
the video to play in the background.
missed rst
further explanation on entry_points
add infinity symbol to calc preview
Add info for polls
Fix URLs for static resources
add some rate limiting to the password reset functionality
Hide save/cancel buttons for native XBlocks in Studio
Add Studio client-side runtime notifications for saving/cancelling XBlock edits.
Fix password reset i18n
Embargo Middleware feature

Adds configurable middleware in common/djangoapps/embargo that
allows specific courses to comply with US Export regulations by
embargoing students from specific countries, whilst simultaneously
allowing other courses to be freely open to all.
Django-admin for Embargo feature

Allows specification of countries to embargo, what course(s) should
apply embargo restrictions, and whitelist/blacklist capability for
specific individual IP addresses.
Merge pull request #2741 from edx/sarina/update-translations

Fix password reset i18n
Add change for help modal in anticipation of i18n support
Tests for embargo middleware feature
Added discussions issue

to delete response comments
Merge pull request #2747 from edx/markhoeber/documentation/release-notes-update

Added discussions issue
Start documenting Staff Debug Info

STUD-1273
Update schema for bok-choy database

Finalize tests for embargo middleware app
Students not receiving credit for peer assessment.
ORA-330
Merge pull request #2724 from edx/will/studio-xblock-save

Native XBlock Studio Save UI