Do not show video player on media-list items

We are currently showing a tiny video player in facia list-media items. This fixes that by showing a fallback image instead and hiding the video element.

Need to do some performance testing to ensure all of our image and video combinations are not causing unnecessary HTTP requests.

#### Before
![google chrome](https://cloud.githubusercontent.com/assets/80089/4403792/6fd99ada-44a8-11e4-8e03-100c1f8bdeb8.png)

#### After
![google chrome](https://cloud.githubusercontent.com/assets/80089/4403793/71072cd8-44a8-11e4-85fb-b0f68222449d.png)

 /cc @robertberry @sndrs @kungpochicken