Added HTML5 DND mouse events to regex

I used this to test my Angularjs DND directives. It works well. Thank you for the module.
good point, that was not in my original code. I had initially worked off an older version. when I decided to contribute this back I forked your project and tried to apply the changes to the new code base. I was at work and hurriedly applied the change to the fork and submitted. I apologize for that. However, I did make sure the change worked by rerunning my tests. I did not just fire and forget. I am willing to write tests and resubmit a cleaner pull request.