Add MetaKey property.
See http://api.jquery.com/event.metaKey/
Add missing properties on ElementEvent object.
See
http://www.w3schools.com/jsref/dom_obj_event.asp
and
http://help.dottoro.com/ljogndjk.php
remove new line.
Merge pull request #344 from jimmygilles/master

Add missing properties on jQueryEvent and ElementEvent.