AUI-1156 - AUI TreeNode does not show "Load More Results" link

Hey @ipeychev,

Attached is an update for http://issues.liferay.com/browse/AUI-1156.  I was not sure how we could go about making a test for this so that is why I sent this to you, but if we do not need a test, then I can send it to @natecavanaugh.

Please let me know if you have any questions.  Thanks!