* Guid as a primitive

UA Guids based on python UUID type

* Guid primitive fixes, import datetime

* Fix Guid NodeId, typos, tests

* Add guid test, python 2.7 fixes

* Guid fixes for modeler

* Pep fixes for edited files

* Fix pep refactor

* Remove string check for datime/guid

this function assumes correct value is supplied, update doc string

* - added tools/uacall script

* As suggested by oroulet corrected misunderstandings in signature of
Node.call_method(). No parent needed, just use self.

* Old folks, knowing Python2.x only, keep forgetting that print should
have been a function in the first place...

Added support for Double and Float value extensions in XML importer.

* move ns relative functionality from parser to importer

* move rel ns handling to xml_import

* also move working version of _sort_nodes_by_parentid to xmlimport

* because moved methods updated test_unit.py

* theoretical fix and tests for namespaces xml exporter

* Revert "hack around broken namespace import from xml"

This reverts commit 1a5475f1.

* better testing av exporting and reimporting namespaces

add export import xml tests and fix et obj related bug

This reverts commit 3f750a92.

Only create an argument if needed
Create argument properties in the same namespace as the parent method

* Add link_method to server

shortcut to linking python functions to UA Method nodes, for example
after instantiating an object from object type which has a method.

* Use better path to session

* Prevent the UASocketClient from hanging

Added a timeout to the socket connection that prevents the ``UASocketClient`` from hanging on  ``_receive`` in ``_run``.

* introduces new socket_timeout

* added socket_timeout to Client

* fixed small bug

* added timeout handling to SocketWrapper

Fix for #307

Fix more issues if re-exporting DI schema

Xmlexporter fixes