Add ability to drop down to show on top of anchor view if not enough place on bottom
Add ability to drop down to show on top of anchor view if not enough place on bottom

kevin-hirsch/DropDown,tskulbru/DropDown,Jauzee/DropdownMenu,AssistoLab/DropDown,AssistoLab/DropDown,Jauzee/DropdownMenu,kevin-hirsch/DropDown,tskulbru/DropDown