Depth count - difference between current code and demo

[Vilfago]

First, thanks for this plugin !

The demo don't use the same code as the current code, which cause issue in depth count.

Modification below are related to toArray method.

Current code, line 752

$(this.element).children(o.items).each(function () {
    left = _recursiveArray(this, sDepth, left);
});

To be change to :

$(this.element).children(o.items).each(function () {
    left = _recursiveArray(this, sDepth + 1, left);
});

and same in _recursiveArray

if (depth === sDepth) {
    pid = o.rootID;
} else {

to

if (depth === sDepth + 1) {
    pid = o.rootID;
} else {