gem updates
support for parsing status summary output
methods for querying hostgroups and servicegroups summary
fix url
add {service,host}groups commands
skip when group is nil
revert to zero, not nil
fix hostgroup url
need different parsers for hostgroup and service group status summary views
add support for {service,host}groups ascii table output
Merge pull request #1 from obfuscurity/servicegroups

Support for supportgroups/hostgroups summary parsing