Fix installation of Categories Module

This PR partially fixes the Categories module installation where the `categories_registry` was not being created. Now the default data does not install. I would like some assistance with this please. ping @tfotis, @Guite, @planetenkiller @phaidon @craigh 
ref #677 #680 

![category_stacktrace](https://f.cloud.github.com/assets/251852/87120/66a8a64c-64b5-11e2-9fd8-578fec2fc917.png)