MAIN-857 fixing admin dashboard modals

@nandy-andy @kvas-damian Tagging some guys on the consumer team because I believe Admin Dashboard is owned by you guys. 

The ticket is https://wikia-inc.atlassian.net/browse/MAIN-857.  Basically I removed the href param and used "mousedown" instead of "click" so that navigation and tracking can both occur without hijacking the event and forcing navigation.  I looked it over in FF, Chrome, IE9 and IE10 and I see the tracking calls still going through. 

Please have a look to make sure this doesn't cause any unintended consequences that I'm unaware of.  Thanks!