Version 1.3.8 released

Add a getURI method to get the URI of the document which was used to create an XMLRoot node
Add a convenience hasAttributes() method to return if an XMLNode has attributes
Add a getNodeLevel() method to get the node level in the nodes hierarchy
Add a constructor in the XMLRoot to create a XMLRoot node from a XMLNode
Allow to specify a NodeSerializer to print an XMLNode tree
Allow to keep the order of attributes as they were added when serializing the content of an XMLNode tree
Add a factory allowing to create a DOM Document from an XMLRoot