Upgrade JSDraw.
Merge pull request #3308 from edx/adam/hotfix-js-draw

Upgrade JSDraw.
Update video
Use bulk email as is for course email
Remove git version from STATIC_URL
Disable cache busting
Disable cache busting for studio as well
Add XForwardedFor middleware
Change redirect URL when disconnected
Change logo url when not logged in
Add create_account server events to tracking log