[handler-set] allow any handler to be a set
[handler-set] allow any handler to be a set

keymone/sensu,javrasya/sensu,miyakawataku/sensu,disqus/sensu,cread/sensu,rbramwell/sensu,withnale/sensu,sensu/sensu,bf4/sensu,roobert/sensu,portertech/sensu,disqus/sensu,upfluence/sensu,somic/sensu,crewton/sensu,Tapjoy/sensu-mirror,m4ce/sensu,solarkennedy/sensu,quodlibetor/sensu,npe9/sensu,yonglehou/sensu,zuazo-forks/sensu,pauloconnor/sensu