Category's for Lists - Part 1.

TODO:  Menu item and category screen title.
Merge branch 'master' of https://github.com/Fabrik/fabrik
Formatting
Arrrrrrrrrrrrrgggggggggggh!
If a category was selected that wasn't assigned all entries were shown.  The correct result would be 'no reults'.
Formatting.
Merge branch 'master' of https://github.com/Fabrik/fabrik