Attempting to fix Xooie click capture issue

If there are multiple Gallery Rows on a page and you click an item in one row, then click an item in another row, and then click a button in that item that does something on the page (like launch a Flash video player) Xooie will capture all clicks & preventDefault, rendering the mouse useless.

These changes attempt to do 2 things:
1. Always collapse the dropdown if 'collapse' is called (should take care of the multiple Gallery Row issue)
2. Expose a 'forceCollapse' event that can be triggered & calls collapse (because I've seen that sometimes, for reasons I'm not quite sure, collapse isn't called)