fix(drop-down): close drop-down regardless of `stopPropagation()` calls
fix(drop-down): close drop-down regardless of `stopPropagation()` calls

As of now, an event-handler on the `document` is responsible for closing the
drop-down. A click-event stops bubbling when `stopPropagation()` is called,
therefor it breaks the closing of the drop-down.

Registering the event-listener in capture phase fixes this bug.

Jefiozie/ui-select,Jefiozie/ui-select,angular-ui/ui-select,Jefiozie/ui-select,angular-ui/ui-select,angular-ui/ui-select