add back_normal and back hightlight back
add back_normal and back hightlight back

leonzhang1109/cordova-imagePicker,FrankSunnyvale/cordova-imagePicker-1,yakso/cordova-imagePicker,FrankSunnyvale/cordova-imagePicker-1,leonzhang1109/cordova-imagePicker,yakso/cordova-imagePicker