* `ExceptionInterface`: all Respect\Validation\Exceptions implement through inheritance
* `ValidatorExceptionInterface`: implemented only by AllOfException. This allows the end users to know when there has been a Validator exception rather than just any of our exceptions.
Fixed formatting issues
Created two new exception types
* Created ValidationExceptionInterface
* Created NestedValidationExceptionInterface which extends ValidationExceptionInterface
* Renamed from ValidatorExceptionInterface
* ValidationException implements ValidationExceptionInterface and ValidationExceptionTest checks for the implementation.
* AbstractNestedException implements NestedValidationExceptionInterface and AbstractNestedExceptionTest checks for the implementation.
* CheckExceptionsTest now checks all Rule exceptions to make sure they implement ValidationExceptionInterface
* ValidatorTest now contains test that shows that only ValidationExceptionInterface can be used reliably with `::check()`
* Updated documentation for new exception types
* Reworked examples to show how to catch the exception interfaces
Minor changes in readme.md and ExceptionInterfaces
* Removed `import` statements (hahaha)
* Renamed `$e` to `$exception`
* `ValidationExceptionInterface` now extends `ExceptionInterface`. Changed `ValidationException` to match
