AUI-931 Tree view checkboxes aren't displayed when paginated
AUI-934 Uses headerEventHandler string on A.bind to allow it to be displaced
AUI-927 Load More Results message behaves badly when dragging out/in pages into the subtree
AUI-927 - Source formatting
AUI-934 - Apply the same pattern to _onAnimatingChange too
AUI-925 Update to new YUI API
Merge branch '2.0.x' into pull-request-187-AUI-934