So @macfanatic, @gregbell, @pcreux etc... any idea why we have the nearly identical `AA.DropdownMenu` and `AA.Popover`?

`AA.Popover` was incorrectly marked here as initializing the batch actions dropdown menu, when it's really `AA.DropdownMenu` (the next one in this file) that does it.

With an Active Admin site open in my browser, I can't find any `$('.dropdown_button')` elements that this would initialize.

Thoughts?