Make CMS user view not show ErrorDescriptor courses

Feature/cdodge/convert to portable links on import and clone

Fix jumping to the top of the page on unit delete.

add a few debug messages to get localhost debug information. Also partition out the MongoDjangoToolbar configuration into a separate env config. This is because doing imports on large courses grinds localdev to a halt due to all the stack trace generation.

add another test. Seems like we never had an explicit test on an import into a new course-id. This fixes that

also support a link rewriting on course import and clone for the following format /courses/[org]/[course]/[run]/. We just need to substitute in the new course-id.

add ability to rewrite links on the old /courses/<org>/<course>/<run>/jump_to/i4x://&lt;org&gt;/&lt;course> .. intracourseware linking to the new portable /jump_to_id/<id> format

changing http:// to // on intro video urls

Upgrade diff-cover to newest version

Jonahstanley/fix courseteam tests

Fix enroll-multiple button

Feanil/master with release

make template string unicode

Add cronjob analytics to instructor dashbaord

Update the XBlock version to fix save bugs

give some debug message regarding why export has failed

Valera/captions keyboard access 2

In speed control, when it is focused, a drop down becomes available which contains all
of the available speeds that the player can switch to. When using the Tab button to
tab through all of the controls, it should be possible to select individual speed with
the keyboard.

Only relevant part of string will go through the Python internationalization function.

Previously we were using dummy YouTube IDs such as "slowerSpeedYoutubeId", and "normalSpeedYoutubeId".
This was causing errors when the code tried to fetch metadata from YouTube with that ID. We can't
stub these fetch requests because the data that is fetched is necessary. For example it contains
the length of the video.