Add ValidationException + mapper

Useful for manual validation

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Add exception mapper for jsr303 ConstraintViolationException

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Rename ValidationException->ValidationErrorsException to as name clashes with javax.validation class

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Drop useless implements implements ExceptionMapper<...>

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Fix license headers

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
JavaDoc

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge pull request #7 from sonatype/validation

Validation (manual + jsr303)