Support for creating a fedora RPM package with maven

Note: This has been disabled by default and is therefore not included in a
standard build. The main reason for this is, that you need to have a RPM
binary and the rpm development packages installed, which is not the case
on many systems.

Also the created RPM only works for Fedora. There does not seem to be a
possibility to create RPMs for different platforms out of the box (for
example the location of the init-scripts differ with OpenSUSE and Fedora).

You can build your own RPM package simply by running 'maven rpm:rpm'