lots of ux changes

### Changes
Making the "add_repo" page more like a "manage projects" page.
You can add and remove them!
Also more compact.

And the "Add Repo" button on the dashboard has moved to be the "Projects" tab in the top nav.

Projects page:
![screen shot 2013-07-14 at 12 00 52 am](https://f.cloud.github.com/assets/112170/793878/559e8dda-ec4b-11e2-8e7f-12b0b728a0ab.png)

When you try to turn an active project "off", you get a confirm dialog:

![screen shot 2013-07-14 at 12 01 13 am](https://f.cloud.github.com/assets/112170/793879/63bf654c-ec4b-11e2-8a3c-3e73f2a7e81c.png)

Turning a repo "on" takes you to the "kickoff" page.