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Refactored JSONResponseVerification, adding support for top-level arrays

JSONResponseVerification#verify replaces JSONResponseVerification#validate_hash_response (which is still available for backguard compatibility).
add support for optional namespaces
Merge pull request #27 from kamui/optional-namespaces

Add support for optional namespaces
Merge pull request #25 from raul/support-top-level-array-responses

Support top level array responses