Add specs for #yield, #yieldall
Add specs for #yield, #yieldall

lsegal/yard,amclain/yard,travis-repos/yard,iankronquist/yard,lsegal/yard,thomthom/yard,thomthom/yard,herosky/yard,alexdowad/yard,thomthom/yard,amclain/yard,iankronquist/yard,jreinert/yard,travis-repos/yard,herosky/yard,lsegal/yard,ohai/yard,alexdowad/yard,ohai/yard,ohai/yard,alexdowad/yard,herosky/yard,amclain/yard,jreinert/yard,iankronquist/yard,jreinert/yard