Restore compatibility (2.0)

This PR updates configuration and scripts to be compatible with current arsnova-* master-Branches and ARSnova 2.0.

To fully restore compatibility the following changes have been made:
* Update Jenkins-Jobs: separate deployment jobs for Backend and Mobile are needed
* ARSnova Mobile POM has to be updated to allow deployment to Tomcat
* Tomcat deployment at startup has to be separated for Backend and Mobile

These changes have been tested in dev and production VMs with commana/arsnova-debian-wheezy-puppet3-amd64 box.