Migrate most of ko.computed's per-instance functions on to its prototype
Migrate most of ko.computed's per-instance functions on to its prototype

getshuvo/knockout,skyh/knockout,gwokudasam/knockout,moonpyk/knockout,ErikSchierboom/knockout,bago/knockout,stonegithubs/knockout,brianmhunt/knockout,brianmhunt/knockout,getshuvo/knockout,pianove/knockout,gwokudasam/knockout,ErikSchierboom/knockout,pianove/knockout,bago/knockout,mattbalmer/knuckles,xeronith/knockout,skyh/knockout,mattbalmer/knuckles,youprofit/knockout,youprofit/knockout,xeronith/knockout,moonpyk/knockout,stonegithubs/knockout