Addressed some of Christina's review comments.

speeds and don't use the video/default.yaml format.

Fixed orphaned graders (manifested as url not defined)
To keep assignment type blur from spamming warnings, I made all blurs
check whether the data changed before doing any other behaviors.

the first yesterday. Fixed formatting of compounded video string errors.

parse_videosource but neglected to fix this one.

The scss junk comes from trying to sync w/ several branches. I believe
it's right but mostly unnecessary (surprised it showed up).
Debugged the merge w/ cms-master
Fixed grace period to be absolute time difference not a date on the
client side.

crossdomain policy violations when i try to validate.