Added rules for 3dcenter.org, forum-3dcenter.org, urlaubspiraten.de and df.eu.
Added rules for abosgratis.de and tum.de.
Updated the rules for 3dcenter.org, forum-3dcenter.org, df.eu and urlaubspiraten.de so that their bare domain is matched.
Added bare domain target host to 3dcenter.org, df.eu, forum-3dcenter.org, urlaubspiraten.de.
Merge pull request #363 from jbreitbart/master

6 new rules for german sites