Fixed couple of typos in session.js
Fixed couple of typos in session.js

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