The error message when the host is already in the whitelist is somewhat confusing - it says `Domain has already been taken` with the default red highlighting, when actually it's a good thing that it's already there. Should it perhaps redirect back to the whitelist page with a green flash saying something like `This domain is already in the whitelist`?

![screen shot 2014-06-03 at 12 35 07](https://cloud.githubusercontent.com/assets/1822424/3159580/2118e7d2-eb13-11e3-9c6d-abd02df2f307.png)