Issue 100: Add URL to projects

Issue #100 
- Added URL column to projects
- Added URL (Website) field to projects form and projects admin
- Set Project name to link to project URL if present

![screen shot 2014-01-21 at 10 40 45 pm](https://f.cloud.github.com/assets/85859/1968555/baf3118a-82e4-11e3-9e36-f9c86ba1ca82.png)