switching up/down arrows to be more consistent
switching up/down arrows to be more consistent

See http://ivaynberg.github.io/select2/ and http://harvesthq.github.io/chosen/ .
Arrow should be pointing down when selectbox is closed, and pointing up when selectbox is open.
prog666/multiple-select,PeterDaveHello/multiple-select,M1K3YLIK3SI7/multiple-select,wenzhixin/multiple-select,vfigueiro/multiple-select,UziTech/multiple-select,jianlinwei/multiple-select,delaetthomas/multiple-select,mwang0308/multiple-select,mwang0308/multiple-select,avinoth/multiple-select,UDenis/multiple-select,M1K3YLIK3SI7/multiple-select,UDenis/multiple-select,delaetthomas/multiple-select,wenzhixin/multiple-select,richlloydmiles/multiple-select,YechengZhou/multiple-select,YechengZhou/multiple-select,vfigueiro/multiple-select,PeterDaveHello/multiple-select,richlloydmiles/multiple-select,avinoth/multiple-select,UziTech/multiple-select,danielgindi/multiple-select,scottduong/code,jianlinwei/multiple-select,prog666/multiple-select,davidecantoni/multiple-select,wenzhixin/multiple-select