Fixes #551 - Reqs Category Styling - List View

The following commits fixes #551 by means of pushing the Categories to the bottom of individual Requests as the fix for issues #268 for Offers. Additions have been made in terms of CSS and helper methods. 

How ever it due to the lack of knowledge in multilingual approach, I am using the same translated context as in Offers ( below ). The `en.yaml` didn't have some thing as such for Requests as in Offers. 

     def horizontal_formatted_req_categories( categories, prefix_text = t('offers.partial.listed_in'))

It currently looks as such ( attached image ).

![req changes](https://f.cloud.github.com/assets/762159/2319045/8773415c-a375-11e3-83ce-8107584db7ed.png)