Delete all unused factories

Squashed commit of the following:

commit dfe0e64b6abee3cca4496ffa988e22da65d26710
Author: Thomas Schank <DrTom@schank.ch>
Date:   Fri Nov 14 10:19:58 2014 +0100

    Add user and person factory

commit 1f1eb1013d5dcdbfcfeb8b1055b43b902577866f
Author: Thomas Schank <DrTom@schank.ch>
Date:   Fri Nov 14 10:16:23 2014 +0100

    Delete all old factories
Delete all in app/*, vendor/*, config/initializers/*  we do not need right now
Clean stuff in /lib
Add TODO comments to modules which are clearly messy but won't get done in v3
Refactor and test MetaDatumString