Fix opening / closing of dropdowns on clicks.
Fix opening / closing of dropdowns on clicks.

 - Do not prevent click event propagation so that other open dropdowns
   will know to close themselves when a new dropdown is opened
 - In the event handler, set opening to false if it is true, otherwise
   check to see if the click was outside the menu and close the menu

unicef/polio,unicef/polio,unicef/polio,unicef/rhizome,unicef/rhizome,SeedScientific/polio,SeedScientific/polio,unicef/rhizome,SeedScientific/polio,SeedScientific/polio,SeedScientific/polio,unicef/polio,unicef/rhizome