Moved git update functionality from core to plugin
*bugfix for missing version-file (when running directly from git repo)
*icon paths corrected
*Git Updater: fixed crashes under Linux

minor problem: if lunchinator is running from a shell it will detach
itself in case of an update...
Handling pip stuff on Windows

*installing pip on Windows automatically is a nightmare. Since only
developers will use the non-pyinstaller-version a simple alert should be
enough
Merge branch 'gitupdate' into thinner

Conflicts:
	lunchinator/start_lunchinator.py