fixed check_sip for ubuntu 12.04 (library directory issue)
added a concept of host definition transformation; the hostgroup is defined using databag, and within the hostgroup definition there's an attribute called "transformation_map", that is a hash; each key of the hash is a host definition attribute, and the value of the hash is a string that is evaluated to the real value; eg.: "_application_port": "n['my_application_port']"; the 'n' attribute will be evaluated within the host template
fixed the hostgroup template; "members empty" attribute is not allowed
setup the hostgroup_name as the role used on Chef Server
included the hostgroup definition used to map hosts attributes
fixed the issue with the json interface for nagios
refactored the nsca cookbook to avoid unnecessary downloads and other little improvements