Update src/server/session.coffee
Update src/server/session.coffee

callback is not defined, removing it
hhzplst/togetherjs,igmcdowell/ShareJS,playcanvas/ShareJS,abhishekgahlot/togetherjs,abhishekgahlot/togetherjs,a0x/ShareJS,gdseller/ShareJS,youprofit/togetherjs,m4h4n/togetherjs,kustomzone/ShareJS,googlearchive/togetherjs,ceros/ShareJS,hhzplst/togetherjs,TimeTravelersHackedMe/togetherjs,zartata/togetherjs,hhzplst/togetherjs,TimeTravelersHackMe/togetherjs,playcanvas/ShareJS,luto/ShareJS,rasata/ShareJS,AlphaStaxLLC/togetherjs,googlearchive/togetherjs,m4h4n/togetherjs,m4h4n/togetherjs,kyroskoh/togetherjs,AlphaStaxLLC/togetherjs,ericariyanto/togetherjs,share/ShareJS,zartata/togetherjs,googlearchive/togetherjs,ceros/ShareJS,mcanthony/togetherjs,modulexcite/ShareJS,kyroskoh/togetherjs,kyroskoh/togetherjs,Nzaga/ShareJS,abhishekgahlot/togetherjs,hhzplst/togetherjs,TimeTravelersHackMe/togetherjs,AlphaStaxLLC/togetherjs,mcanthony/togetherjs,kyroskoh/togetherjs,mcanthony/togetherjs,TimeTravelersHackMe/togetherjs,mcanthony/ShareJS,youprofit/togetherjs,shamim8888/togetherjs,youprofit/togetherjs,abhishekgahlot/togetherjs,rchrd2/ShareJS,TimeTravelersHackedMe/togetherjs,zartata/togetherjs,ericariyanto/togetherjs,gdseller/ShareJS,m4h4n/togetherjs,youprofit/togetherjs,TimeTravelersHackMe/togetherjs,dialoghq/ShareJS,shamim8888/togetherjs,dialoghq/ShareJS,dialoghq/ShareJS,TimeTravelersHackedMe/togetherjs,freewind/ShareJS,ericariyanto/togetherjs,shamim8888/togetherjs,ericariyanto/togetherjs,AlphaStaxLLC/togetherjs,shamim8888/togetherjs,matthewbauer/ShareJS,zartata/togetherjs,mcanthony/togetherjs,TimeTravelersHackedMe/togetherjs,kantele/k-share,igmcdowell/ShareJS,erpframework/ShareJS