added rough sketch for class for writing mobile traces
added initializiation and registration of mobile data listener to class AbstractOMNeTARAClient
redesigned class MobilityDataPersistor
the write method in class MobilityDataPersistor now  writes the positions to stdout (for demo purposes)
fixes #61
Merge branch 'mobilityTrace' into develop
removed old code
Merge branch 'develop' of github.com:des-testbed/Ara-Sim into develop