Files for debian packaging added

The following files have been added to the ubuntu branch:

debian/changelog: Changelog for automatic versioning of packaging process (must be updated when increasing LISPmob (sub-)versions)
debian/control:      Control file with package information  (must be updated when increasing LISPmob (sub-)versions)
debian/copyright:  License text (GPLv2)
debian/rules:        Incomplete debian specific Makefile. The required targets have been added but not implemented as I don't know the build structure of LISPmob, yet. Please add the missing target routines.