def resque_server
      u = self
      servers = Jobtracker.deploy_servers
      server_i = u.name.to_md5.gsub(/[^0-9]/,'').to_i % servers.length
      servers[server_i]
    end
def resque_server
      u = self
      servers = Jobtracker.deploy_servers
      server_i = u.name.to_md5.gsub(/[^0-9]/,'').to_i % servers.length
      servers[server_i]
    end
identifies the server which should process this user's jobs
determined by available servers in config/deploy/<env>
otherwise, localhost