added args and a simple stub for binding a server object to a service group object
added first stab at binding a server object to a service group object
added appropriate imporrt
fixed up bindservertoservicegroup, added unbindserverfromservicegroup options + clean error handling for both
Merge pull request #3 from cboggs/master

Add {,un}bindserver{to,from}servicegroup options to nsnitrocmd.py