video page fixes

Changes
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- Auto height for popular video container
- Only break tags into left column at the wide breakpoint on media page
- Removed the second tag container in the media page HTML (can do the same with one)

Fixes
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- Fixes popular video container getting cut off:


![image](https://cloud.githubusercontent.com/assets/960919/4322570/ba5ff87e-3f49-11e4-80be-6dd126c92748.png)

- Partial fix for tags colliding with long bylines:

![image](https://cloud.githubusercontent.com/assets/960919/4322583/cde6bc20-3f49-11e4-8abf-fb352de5cd41.png)

// @Jholder112233 
I prefer this pattern, but to follow our convention further down in the file, `hide-on-wide` ?