Release to production

* origin/rc:
  Fix Enroll-email subject containing newline
  Fix Enrollment Email UI/UX
  send beta testers to dashboard
  Remove commented code
  Cleaning up messes from hurried upstream merge
  move stanford logo where tests can find it
  Code additions to enable Ooyala player XBlock.
Backport release

from Stanford-Online/release
into Stanford-Online/master
Fix json_update_videos()
      commit (1f5c95b) to transcript_utils.py changed the sig of download_youtube_subs
    from def download_youtube_subs(youtube_subs, item, settings):
    to def download_youtube_subs(youtube_id, video_descriptor, settings):

    hence taking a video id instead of a dict.

    This broke the download captions feature from the utilities page.
make unit tests respect mongo port/host settings (with default)

settings are read in from environment variable
Merge pull request #104 from Stanford-Online/jbau/master-parallel-tests

make unit tests respect mongo port/host settings (with default)
Merge pull request #106 from Stanford-Online/dcadams/fix_vid_transcript_dl

Fix json_update_videos()