Generate Reportback form

Admin-only form to allow easier development of Reportback Gallery and Review functionality. Closes #3634

Hardcodes the Reportback uid to the logged in user, because as is, once dployed to staging, this will send live Reportback Transactional emails.

![screen shot 2014-12-16 at 10 57 33 am](https://cloud.githubusercontent.com/assets/1236811/5456557/68b0b400-8512-11e4-8ebf-2cdfd5362c93.png)

A nice to have TODO: Allow setting the Review status automatically, e.g. `approved`, `promoted`.

[`array_rand`](http://php.net/manual/en/function.array-rand.php)?