Adds an edit button to divisions consistent with policies

Adds a persistent edit link to divisions, exactly like policies. The small screen layout isn't great, but it's consistent with policies and they can be improved together in the next pass.

Closes #927 

![screen shot 2014-10-29 at 1 24 59 pm](https://cloud.githubusercontent.com/assets/1239550/4820270/ef549ba0-5f12-11e4-9154-36ddd3bc341f.png)
![screen shot 2014-10-29 at 1 24 42 pm](https://cloud.githubusercontent.com/assets/1239550/4820272/ef595938-5f12-11e4-96f5-6c9b71cbf9a1.png)
![screen shot 2014-10-29 at 1 24 34 pm](https://cloud.githubusercontent.com/assets/1239550/4820271/ef57c762-5f12-11e4-82cf-250431c07e29.png)