Some enhancements and additions to DataAnnotations, incluiding implemented of a few missing pieces of Sys.ComponentModel.DataAnnotations v4.5, like:
	- CompareAttribute
	- CreditCardAttribute
	- EmailAddressAttribute
	- FileExtensionsAttribute
	- PhoneAttribute
	- Implemented  IsValid() methods of Min/MaxLengthAttribute.
	- Fixed all existing Validation attributes so they take into account current's locale when composing ErrorMessage.
Set correct author on test files.
Reverted string.Format(CultureInfo.CurrentCulture, ..) change.
Merge pull request #740 from pruiz/dataannotations-enhancements

Some enhancements and additions to DataAnnotations, incluiding implementation of a few missing pieces of Sys.ComponentModel.DataAnnotations v4.5, like: