iPad UI fixes, YouTube HTML5 player

Note: Commits before Jan 23rd are from [a previous pull request](https://github.com/reddit/reddit.tv/pull/81) that's already been merged into reddit/reddit.tv master. Not sure why this is happening, as these commits are already there.

Resolves issue with YouTube player appearing squished on the iPad.
Replaces YouTube Flash embeds with HTML5 iframe embeds for proper resizing.
Adds click action to header to allow touch interfaces to more easily access video list.
UI changes to iPad interface, borderless video, cleaner channel organization.

![img_0001](https://f.cloud.github.com/assets/113293/2015584/202bc730-87be-11e3-89ce-712b65c6036f.PNG)