Getting rid of left sidebar, right sidebar modifications

Here's what's different:

- (Bringing mobile-icons up to date with master)
- Getting rid of left sidebar on small (relevant code removed from PHP and JS)
- Switched right sidebar logo to new logo
- Right sidebar is opaque on small
- Right sidebar has larger links on small
- Right sidebar includes user links on small

Here's what the right currently sidebar looks like on small:
![before](https://f.cloud.github.com/assets/5515877/1812160/84ccb3d8-6e6f-11e3-8c8a-60f26b072b33.png)
Here's what it should look like with these commits:
![after](https://f.cloud.github.com/assets/5515877/1812161/87836162-6e6f-11e3-8765-e93b0356ed77.png)