Allow credentials (cookies) to be sent in license request
If the license server is not on the same-origin as the application, CORS headers are needed to permit this. However the XHR.withCredentials option was not set, so cookies were not being sent to the license request, which is a requirement for our setup.
Updating minified files
Allow license URLs to be customised by calling code.

Currently the license acquisition URLs for protected content (e.g. PlayReady) are baked into the media files, and there isn't a way to change this at run-time. Have added a way for the client code to set an (optional) resolver for these URLs based on the keySystem identifier (e.g. com.microsoft.playready)
Add test for MediaPlayer for setting license URL resolver
Run grunt uglify to fix merge errors
Merge branch 'jonoblinkbox-AllowCredentialsInLicenseRequests' into development