Merge pull request #127 in FS/freeswitch from ~ITALOROSSI/freeswitch:mod_callcenter-queue-list-count-by-state to master

* commit 'f63f8686':
  FS-7049 - Documentation for state optional paramenter in callcenter_config queue list and count
  fix FS-7049 - Count and list agents based on their state