Added code for drawing nodes and their descendents offset.
Replaced drag & drop events with mousedown/over/up events.
Introduced some bug where it will jump a couple hundred pixels to the down and right. Not easily repeatable.
Fixed bug with clientX vs pageX
Fixed stupid teleportation bug introduced in 659545e.
Lowered drag threshold. Made dropParent selection algorithm more intuitive.
Merge branch 'master' into gh-pages
(compiled js)