Release Notes - Sept 25, 2014

@srpearce @andy-armstrong 

@lou-wang   doesn't yet say anything about mobile.  need some guidance on how we want to announce.
This went in last week (after lots of discussion about wording):

To help course teams protect video assets, the edX video player now hides video URLs from students by default. This functionality is now in effect for all video files, including those that are not hosted on YouTube. Students can still download videos if you have selected the Video Download Allowed option for your Video components. (TNL-302)