Update "checked" binding specs for better cross-browser consistency
Update "checked" binding specs for better cross-browser consistency

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