jQuery: removed redundant interface

Prompted by this email from Michal Kutil:

Dear John,
I would like to ask for this commit:
https://github.com/borisyankov/DefinitelyTyped/commit/e65a30bcc8bd5179302f67d3fc8cbb07c2bd3743

Did you remove “easing” property because it is not documented on http://api.jquery.com/ or because the JSDoc comment over property is missing?
If JSDoc comment is missing I can create one and send pull request.
On the other side, if you removed it because it is missing on http://api.jquery.com/, please remove unnecessary interface JQueryEasing, too.

Thank you for response and best regards,
Michal