Adding a detection of the HTMLDocument for IE7/8 compatibility #127
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#126
The only change I added is an aditionnal detection when the type if object to check on the nodeType and detect if it's a HTMLDocument.
Currently in IE7/8, it will return [object Object] as the type, which is interpreted as an Object and will break when $.unlink is called.
This behaviour is breaking JQuery.spacetree in IE 7/8.
Other browser correctly return [object HtmlDocument](IE 9, Chrome and Firefox)