Deleting redirect documentation/ Adding dynamically generated examples 

Deleted lengthly documentation from Admin/Redirect page, and replaced with a dynamically updated field showing the redirect outcome.
![screen shot 2014-10-20 at 12 15 35 pm](https://cloud.githubusercontent.com/assets/5241140/4707459/dd80ad78-588d-11e4-92ab-d1d96af71d58.png)

Where you do this lookup multiple times, you could save lookup costs by saving this to a variable instead:

```javascript
var field_from_url = $('#id_from_url');
field_from_url.keyup(...);
var from = field_from_url.val();
...
```