Routing values

This branch brings two new *features*, namely:
* Parsing and storing many routing protocol names for a ff-community
* A simple example of a custom service endpoint for retrieving all ff-communities by a 
  routing protocol-name, for example we can now ask: `$ curl "http://localhost:8080/freifunk-api/routing/olsr"`

Fixes:
* Migration1: Many-to-many relations in aggregated text-value topics.

Note:
* While merging your tests I changed the code-formatting style back to "Tab size 4" and "Line-width 120". I hope that is OK with you. If we agree on something here, we could merge our developments more easily in the future.
* This depends on latest DM 4.4-SNAPSHOT, 14 Sept 2014

I will get in touch with you soon via the dm-devel list or here, as you like, so we can share some thoughts on any further development I think now we have a bunch of good cross-section commits illustrating all upcoming tasks & issues.

Have a nice day!