Reduce clutter on CP > Menu for "Manage redirects" link #4433

#4433 

### Changes

* Moves URL into it's own column
* Standardize "edit" and "delete" link display, etc.
* Fix "modified-warning" class so dragged items remain single line, not extra tall.

#### Screenshots

##### Before

![screen shot 2013-11-25 at 5 14 28 pm](https://f.cloud.github.com/assets/228733/1617596/fdbc7378-561e-11e3-9e59-fef21892e1bc.png)

##### After

![screen shot 2013-11-25 at 5 13 01 pm](https://f.cloud.github.com/assets/228733/1617590/e6c0d0b0-561e-11e3-9ba0-9533f5abd169.png)