adds dissertation theses access point

Closes #763 

![screen shot 2014-09-05 at 11 45 30 am](https://cloud.githubusercontent.com/assets/1656824/4169921/ddf1ccda-352c-11e4-8e8a-4ff3f3a81825.png)

You can just assign `base_params[:f]` in the `in` block.