Fix Video player display issue

There is a fix for [BLD-289: video player display issue](https://edx-wiki.atlassian.net/browse/BLD-289).
There is fixed resizing logic. Video resizing was depended on width only before. For now Video is fully resized by Javascript that provide us possibility to change resizing logic depending on the window aspect ratio (fill browser by height or width in the fullscreen mode).


@valera-rozuvan, @frrrances  Please review.