Add version, remove jobs link from Admin menu

Version comes from package.json, and links to
githubs release tags.

The jobs page still exists, but is no longer
in the dropdown, since it is completely broken.

![screen shot 2014-07-23 at 2 35 42 pm](https://cloud.githubusercontent.com/assets/34726/3678201/3fddf048-1298-11e4-9aca-3b4099d6940f.png)
![screen shot 2014-07-23 at 2 36 03 pm](https://cloud.githubusercontent.com/assets/34726/3678202/3fde17a8-1298-11e4-8ab6-a0d9fec2beb5.png)