[Validator] New validator for UUIDs#10291

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colinodell wants to merge 2 commits intosymfony:2.3from

colinodell:uuid-validation

Commits on Feb 20, 2014

[Validator] Added new validator for UUIDs
colinodell
committed

Commits on Feb 28, 2014

Fix constant name having wrong version number
colinodell
committed