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
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.
Add change for help modal in anticipation of i18n support
Tests for embargo middleware feature
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
fix method name to actually make sense
Merge pull request #2711 from edx/cdodge/throttle-forgot-password

add some rate limiting to the password reset functionality
Add new container page that can display nested xblocks

This is the changes for STUD-1244, which introduces the ability for Studio to display
arbitrarily nested xblocks. In this change, a new container page is introduced which can
display nested xblocks. In particular, the xblock type of 'vertical' is special cased
to be shown inline as a collapsible section. The unit page is mostly unchanged, except
that container xblock's are shown as a link to their container page, rather than being
shown inline.
Update video docs for multiple language transcripts
Display only the first component name in the page (and nav) title.
STUD-1351
Merge pull request #2539 from edx/andya/nested-xblocks

Add new container page that can display nested xblocks