Additional logic to handle more course_image URL edge cases
This changes logic to allow more missed use cases of course_image to
work properly.  The cases are:

. XML courses with the course_image attribute set
. Mongo courses that are imported without a contentstore
. Mongo courses that have course_image set but don't have a content store

It also exports default images_static_course.jpg to
images/static_course.jpg to handle a use case where a course author
uploaded an image to the default location in studio without using the
studio interface for adding course images, they then export the course, and then
import it without a contentstore
Rebalance CMS acceptance test shards
Add ability to deactivate GA snippet
Merge pull request #3606 from edx/renzo/no-ga

Add ability to deactivate GA snippet
removing larger size for CodeMirror for funky visual behavior on Checkbox problems in release
Fixed simple editor text showing in advanced editor.
Remove (Grade Me!) template until it can be productized.
Merge pull request #3611 from edx/frances/fix/codemirror-overflow-checkboxes2

Fix for Codemirror overflowing Multiple Choice modal
Merge pull request #3614 from edx/waheed/fix-simple-problem-editor

Fixed simple problem editor text showing up in advanced editor
Merge pull request #3616 from edx/christina/remove-template

Christina/remove template
add quotation mark to _dashboard_course_listing.html
Merge pull request #3620 from edx/adam-add-quotation-mark

Adam add quotation mark
Show same thing on dash for audit and honor code students.
Merge pull request #3627 from edx/diana/fix-audit-cert

Fix audit certificate display
Fix dashboard template around final grade status

* ae8847cd6e73 checked in buggy conditional in the dashboard templates
  that caused an empty 'details being wrapped up' box to display
  regardless of whether it was true.
* Simplify conditional so that we care only whether output of the view's
  _cert_info() says 'processing', which should be the value computed when
  either no cert status exists or when the certs are, in fact processing.

  This should mean that the "details being wrapped up" message is
  displayed when certs haven't run and the grade box is displayed the
  rest of the time.
Merge pull request #3629 from edx/jrbl/oops-fix-dashboard-template

Fix dashboard template around final grade status
Disable a flaky ORA Javascript test.
Merge pull request #3636 from edx/diana/disable-flaky-js-test

Disable flaky Javascript test
BLD-1057: Fix Video player in FF.
Merge pull request #3671 from edx/adam/rebase/anton-fix-video-in-ff

BLD-1057: Fix Video player in FF.