get/set bluetooth power and discoverable state

blueutil - show state
blueutil power|discoverable - show state 1 or 0
blueutil power|discoverable 1|0 - set state

Uses private API from IOBluetooth framework (i.e. IOBluetoothPreference*()).

Originally written by Frederik Seiffert ego@frederikseiffert.de http://www.frederikseiffert.de/blueutil/