- Deriving the version number from the mirall tar ball filename, per default.
  We can remove the version => ... entries from package.cfg now.
- added  OBS_INTEGRATION_VERBOSE, OBS_INTEGRATION_OSC for
  debugging and more flexibility when calling osc. Suggested usage:
  env OBS_INTEGRATION_OSC='osc -Ahttps://s2.owncloud.com' ./genbranding.pl ...
- added OBS_INTEGRATION_PRODUCT to overwrite the default product openSUSE_13.1
- added '--download-api-only' per default to avoid issues with download.o.c.
- fixed the year in changelog entries.