Deactive projects

Relevant to #317

![screen shot 2013-12-01 at 20 24 55](https://f.cloud.github.com/assets/159200/1651159/bf74bed4-5ac6-11e3-9e8a-798c6bd67f37.png)

A similar view is visible in Manage Projects. Inactivated projects are not editable and are displayed at the end.