Clean up doc refs created by connection when docs close
Clean up doc refs created by connection when docs close

dialoghq/ShareJS,Nzaga/ShareJS,kustomzone/ShareJS,mcanthony/ShareJS,erpframework/ShareJS,playcanvas/ShareJS,dialoghq/ShareJS,gdseller/ShareJS,gdseller/ShareJS,freewind/ShareJS,rchrd2/ShareJS,share/ShareJS,matthewbauer/ShareJS,ceros/ShareJS,ceros/ShareJS,igmcdowell/ShareJS,playcanvas/ShareJS,dialoghq/ShareJS,igmcdowell/ShareJS,luto/ShareJS,kantele/k-share,rasata/ShareJS,modulexcite/ShareJS,a0x/ShareJS