Move html tech feature detection earlier than superclass constructor
The MediaTechController calls createEl during its initialization to construct the actual video element used for playback. On iOS, the video element must be recreated during this process so that it doesn't become unresponsive. Make sure that we determine whether recreating the video elemen is necessary before calling the superclass constructor.
Merge pull request #454 from dmlap/issue453

Move html tech feature detection earlier than superclass constructor. Fix #453