Mjp release 0.11

This is actually branched from release-0.11 with an additional knowledge tree "branch" including a few exercises and videos (videos not includes).  The videos are somewhat nonsensical unless you are raising teenage daughters who don't know who Sandra Day OConner or Grace Hopper.  They do demonstrate the use of png and sound files in  the hints and delivery.   Note:  this has continued to function well throughout development over the past 6 months but once a homebrew exercise or video watching goes into the logs and then one flips back to the main branch an error is throw.