Including dropdown with external links to demo
Stopping event propogation when toggling so closeAll isn't triggered at the document level and immediaely closes the opened dropdown
Added event propogation and default action examples
Allow events to propagate after a toggle so clients can listen to native click events on the drop down as well. Instead, prevent `closeAll` from closing any drop downs that have been clicked (and therefore already handled by toggle.)
cache event target jQuery object, add to contributors