Switch all HTML5 video to use custom player

I've modified the [MediaCrush video player](https://mediacru.sh/Cjbft93YWNNu) for use in RES, and switched MediaCrush, gfycat, and fitbamob to use it instead of the native controls (or in the case of fitbamob, the slightly-more-than native controls). The advantages:

* Consistent video player for all three sites
* Drag to resize videos without crappy hack around native controls
* Prettier and more featureful than native controls

![2tqabmjwr9ga](https://f.cloud.github.com/assets/1310872/2057411/a148d02c-8b2b-11e3-9698-2d24ea3b334c.png)