Dynamic Reportback File gallery

Adds `paraneue_dosomething_preprocess_reportback_files` function which populates an array of `photo.tpl.php` output, which handles logic in #3633 

cc @weerd @sergii-tkachenko 

![screen shot 2014-12-12 at 3 25 16 pm](https://cloud.githubusercontent.com/assets/1236811/5418841/cfae9fde-8213-11e4-8488-d33c2ca80f58.png)