Fix "Should update all child contexts and bindings when used with a top-level observable view model" in IE<9
Fix "Should update all child contexts and bindings when used with a top-level observable view model" in IE<9

stonegithubs/knockout,bago/knockout,martijnwetering/knockout,getshuvo/knockout,gwokudasam/knockout,youprofit/knockout,mattbalmer/knuckles,Sir0xb/knockout,DekeYan/knockout,JesseQin/knockout,getshuvo/knockout,cgourlay/knockout,mattbalmer/knuckles,hitesh97/knockout,cgourlay/knockout,moonpyk/knockout,gwokudasam/knockout,xeronith/knockout,stonegithubs/knockout,skyh/knockout,Sir0xb/knockout,moonpyk/knockout,ErikSchierboom/knockout,bago/knockout,JesseQin/knockout,youprofit/knockout,DekeYan/knockout,pianove/knockout,ErikSchierboom/knockout,skyh/knockout,martijnwetering/knockout,hitesh97/knockout,pianove/knockout,xeronith/knockout,brianmhunt/knockout,brianmhunt/knockout