Small cleanup after #19, move catching of exception to process_cmd.
Merge branch 'remove_from_queue' of https://github.com/petteraas/socos into remove-idx

Conflicts:
	socos/core.py
Adds remove 'index' command.
Added extra space between functions.
Fixed
C:299, 0: Wrong hanging indentation.
index,
   ^ (bad-continuation)
C:300, 0: Wrong hanging indentation.
queue_length)
^ (bad-continuation)
Added function remove_range_from_queue(sonos, start, stop)