Quick cleanup of admin tab on editions

* Remove big red talk to a dev message and email
* Be clear that it's an edition that's being deleted, and include the edition number
* Add titles to action sections
* Give feedback when an edition type can't be switched to another format

## Before
![screen shot 2014-11-18 at 11 40 32](https://cloud.githubusercontent.com/assets/319055/5086724/ee51891a-6f17-11e4-9b89-77d8fac65560.png)

## After
![screen shot 2014-11-18 at 11 40 43](https://cloud.githubusercontent.com/assets/319055/5086723/ee4cfa3a-6f17-11e4-9fbb-1f64ef2f40d9.png)