[0.9.12] expose mouse events in callbacks
	add refresh method
	add destroy method
	add delay option
	falsy return value in onMousedown prevents dragging
	fix exclusion of items
	fix ignore for select element (abixalmon)
	fix touch events (prateekjadhwani)
	fix itemPath issues (appending and dragInit)
	improve documentation
[0.9.11] option tolerance accepts negative values
	rewrote enable/disable logic
	added (item|container)Path

[0.9.10]Fix Array.indexOf() error in IE < 9 (Dev-Speranza)
	serialize() assumes one subcontainer per item
	remove call to stopPropagation()
	Added onMousedown()

[0.9.9]	Added options tolerance and distance
	Do not modify Array.prototype (by Joakin)
	serialize respects exclude option

[0.9.8]	Added Serialization
	Added onCancel

[0.9.7]	Support iFrame and Touch events
	Better behavior if the CSS position changes