Fluent-validation

* Make ValidationResut.IsValid virtual
* Add private no-arg ctor to ValidationFailure to help with serialization
* Add Turkish error messages
* Work-around for reflection bug in .NET 4.5
* BREAKING CHANGE - Assemblies are now unsigned.

* Added additional overload for Must that accepts a PropertyValidatorContext.
* Allow rules not in a RuleSet to be executed in addition to rules in a ruleset, eg: validator.Validate(instance, ruleSet: "default,MyRuleset");
* Support Custom rules within top level When conditions.
* Russian localization
* MVC4 compatibility

* Fixed issue 7084 (NotEmptyValidator does not work with EntityCollection<T>)
* Fixed issue 7087 (AbstractValidator.Custom ignores RuleSets and always runs)
* Removed support for WP7 for now as it doesn't support co/contravariance without crashing.

* Support using nullables with cross-property comparisons (GreaterThan/GreaterThanOrEqual/LessThan/LessThanOrEqual)
* Deprecate and exclude mvc metadata extensions. This is out of scope for FV, but the code for this functionality is still in the repo if anyone still depends on this.
* Add support for shared conditions based on David Alpert's patch.

* Workaround issue caused by referencing DataAnnotations in windows client projects (eg WPF). Does not affect web projects/silverlight.

* Dropped compatibility for .NET 3.5 and MVC2.
* Removed the SupportsStandaloneValidation property - this was never properly implemented.
* Implemented Rule Sets
* Add support for CustomizeValidatorAttribute when using MVC integration.
* Remove generic PropertyRule<T> - use non-generic version instead.
* Better support for custom client-side error messages for LengthValidator.
* Add support for MVC3's IClientValidatable
* Implement client-side support for InclusiveBetween validator.
* Implement client-side support for Equal with cross-property validation.
* Implement client-side support for email validator.
* Added credit card validator (plus client side support)
* Add IValidatorInterceptor interface. This can be used to add pre/post hooks to MVC validation integration. An interceptor can either be specified as part of the CustomizeValidatorAttribute or implemented in the validator.
* Better handling of nullable value types.
* Add static FluentValidationModelValidatorProvider.Configure for configuring MVC integration with default options.
* Fixed edge case where custom property names didn't work for Required rules on non-nullable value types in MVC integration.
* Patch - Polish localization.
* Additional overloads of WithLocalizedMessage that support custom format args for consistency with WithMessage.
* Bug fix - overload for NotEqual that takes an expression and an IEqualityComparer did not use the comparer.
* Added the ability to specify which ruleset is used to generate client-side rules.
* Introduced SetCollectionValidator for validating collections (replaces non-generic overload of SetValidator)
* Better type safety using child collection validators.
* Better control of which elements in a child collection are validated using the new Where method.
* Support rules for nested properties at the top level (without needing to use a child validator)
* Support DisplayAttribute/DisplayNameAttribute for inferring property names