Implement stage.lockOrientation() in HTML.
Implement stage.lockOrientation() in HTML.

Not implemented in most browsers, but coming soon to Chrome and IE
mobile. Note that you have to be in fullscreen first.

Also should work in Firefox, but fullscreen on mobile is awkward:
https://bugzilla.mozilla.org/show_bug.cgi?id=779324

Closes #4.

mikedotalmond/flambe,aduros/flambe,weilitao/flambe,mikedotalmond/flambe,markknol/flambe,markknol/flambe,Disar/flambe,mikedotalmond/flambe,Disar/flambe,playedonline/flambe,weilitao/flambe,playedonline/flambe,mikedotalmond/flambe,markknol/flambe,weilitao/flambe,Disar/flambe,aduros/flambe,playedonline/flambe,playedonline/flambe,aduros/flambe,aduros/flambe,Disar/flambe,weilitao/flambe