Added "clean" target to close off all running instances of Chrome, Safari and Spotify

Signed-off-by: enigmait <greg@enigma-it.cm.au>
Merge branch 'master' of github.com:rsalmond/shenanigans

* 'master' of github.com:rsalmond/shenanigans:
  Added "clean" target to close off all running instances of Chrome, Safari and Spotify

Conflicts:
	mac-fabric/fabfile.py