Move RbacDefinitionConfigHandlerTest.php to RbacdefinitionConfigHandlerTest.php (fixes tests)
Improving the speed of array key lookups that use array_key_exists, closes #617
Fix typo, refs #617
Make AgaviConfig handle empty strings properly, closes #616
merging 4b484bfd694a9c06aca1d613aaeab673382c058b to 2a13ef96e6120c5ffb7b9c71caa94e9e269fb236