Redesigned Projects View

A redesign of the Projects view more in line with the design of other sections of the app, such as Plugins.
Also seemed to exist an issue displaying the last time a project was updated, so I replaced it with the project's description — trimmed via CSS to adapt to the application's window size.

Original version:
![tilemill_original](https://f.cloud.github.com/assets/1041/75170/7f250c16-60b8-11e2-97b7-c4023bc164cb.png)

Redesigned version:
![tilemill_redesign](https://f.cloud.github.com/assets/1041/75172/8ef175f8-60b8-11e2-9d13-f613e2d2ae42.png)