Added can.addClass support for YUI. All tests past with YUI now.
Added can.addClass support for YUI. All tests past with YUI now.

Psykoral/canjs,mindscratch/canjs,shiftplanning/canjs,rasjani/canjs,bitovi/canjs,gsmeets/canjs,thomblake/canjs,schmod/canjs,jebaird/canjs,airhadoken/canjs,cohuman/canjs,dimaf/canjs,WearyMonkey/canjs,mindscratch/canjs,rjgotten/canjs,schmod/canjs,patrick-steele-idem/canjs,sporto/canjs,beno/canjs,sporto/canjs,cohuman/canjs,thecountofzero/canjs,SpredfastLegacy/canjs,whitecolor/canjs,beno/canjs,patrick-steele-idem/canjs,yusufsafak/canjs,beno/canjs,patrick-steele-idem/canjs,SpredfastLegacy/canjs,UXsree/canjs,rjgotten/canjs,rasjani/canjs,jebaird/canjs,azazel75/canjs,Psykoral/canjs,jebaird/canjs,bitovi/canjs,scorphus/canjs,rasjani/canjs,rjgotten/canjs,juristr/canjs,whitecolor/canjs,asavoy/canjs,gsmeets/canjs,bitovi/canjs,Psykoral/canjs,WearyMonkey/canjs,Psykoral/canjs,juristr/canjs,tracer99/canjs,ackl/canjs,ackl/canjs,thomblake/canjs,dispatchrabbi/canjs,yusufsafak/canjs,tracer99/canjs,schmod/canjs,rjgotten/canjs,rasjani/canjs,azazel75/canjs,sporto/canjs,scorphus/canjs,bitovi/canjs,ackl/canjs,whitecolor/canjs,cohuman/canjs,shiftplanning/canjs,thecountofzero/canjs,dispatchrabbi/canjs,janza/canjs,tracer99/canjs,WearyMonkey/canjs,janza/canjs,dimaf/canjs,asavoy/canjs,airhadoken/canjs,gsmeets/canjs,UXsree/canjs