collector()
  Statistics collector service.
  
  This service can be used to collect some data for statistics.
  
  Usage: collector(ip_or_hostname='', port=-1,
                   statfile='/var/lib/sagator/status')
  
  Where: ip_or_hostname is an string, which defines IP to bind to
         port is an integer, which defines port number to bind to.
           If port<0 (default), no tcp socket will listen and only
           statistics from file will be processed. It is effective
           for large servers.
         statfile is an string, which defines where to store status
  
  Examples: collector()
        or: collector('0.0.0.0',28)