Added a new validator `UUIDValidator` (+test) for UUID/GUIDs

	modified:   ../../tests/test_validation.py
	modified:   __init__.py
	modified:   validation.py
Merge pull request #92 from RobertSudwarts/amol

Added a new validator `UUIDValidator` (+test) for UUID/GUIDs
Merge branch 'release/2.2.0.2' into develop
Call me picky, but I think license belongs up there
Merge branch 'amol' into develop
pep8
Fix tests for UUIDValidator
Handle case where response.charset is None.
Merge branch 'develop' of github.com:toscawidgets/tw2.core into develop
2.2.0.3
Merge branch 'release/2.2.0.3'