Removing left bar + refining user info on mobile

Alright, this one should work....

This gets right of the left sidebar and places the user info on the left side of the top bar in mobile. Also, if SocialProfile isn't enabled, usernames no longer leave a blank space for the avatar on large screens.

Here's what it looks like on large screens with SocialProfile disabled (there isn't a gap where the avatar would be):
![1](https://f.cloud.github.com/assets/5515877/1971031/bc263fd0-831d-11e3-9fe1-2a19c2477094.png)

Here's what it looks like on mobile with SocialProfile disabled:
![2](https://f.cloud.github.com/assets/5515877/1971032/bffc3ccc-831d-11e3-87c8-aa14d5808b65.png)

With SocialProfile enabled, the avatar displays just like it does currently on large screens, and on mobile the user's avatar/the SocialProfile default avatar displays instead of that generic one in the second picture.