Add the ability to know if fullscreen is available

Not all browsers support fullscreen and for mmv
we need to display/hide the fullscreen button accordingly

Change-Id: I693477dfcadd168ae5930691750b709444eda644
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/152
Github: https://github.com/theopolisme/jquery-fullscreen/pull/6
Merge "Add the ability to know if fullscreen is available"