Fluent-validation

* Support for multiple validators on a single property by using 'And' RuleFor(person => person.Surname).NotNull().And.NotEqual("Foo");
* Added EqualValidator
* Custom validation messages are now formatted in the same way as the default messages
* Assemblies are now signed

* Added ShouldNotHaveValidationErrorFor extension method for testing
* Can now validate specified properties in addition to all properties (eg validator.Validate(person, x => x.Surname, x => x.Forename)
* New validators (RegularExpressionValidator and EmailValidator) contributed by Liam McLennan
* German localisation of validation messages contributed by Philipp Sumi
* Additional overload to 'Must' that takes a Func<T, TProperty, bool>

* Added Silverlight compatibility
* Moved support for the CommonServiceLocator into a separate assembly (FluentValidation.CommonServiceLocator.dll)
* Adding additional interfaces for some of the validators (ILengthValidator, INotNullValidator)
* AbstractValidator now implements IEnumerable<IRuleBuilder<T>>
* Added ShouldHaveValidationError extension method for testing validators

* First public preview