Refactoring to support already started emulators:
- by default are now already started emulators supported (they are not
  any longer ignored)
- even emulators that have been booted after selendroid-standalone has been started, can be used now
- emulators that have not been started by selendroid are not beeing killed at the end of the session
- the command line option -installedApp has been removed completely because that caused to much confusion on the customer side