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 'amol' into develop