+ Session and Rest transport modes implementation done(missing some
error handling)
+ StateHolder implementation done
+ NodeFactory implementation done
+ Added new Method in Node to create a node from a properties object
+ Added Credentials provider interface
+ Started Node implementations : all properties have been set.
	(missing the way property values are set using xml, json, or map
object.)
new classes added 
	- HttpResponse parser
	- PydioProtocol