serialization support headers
removed tap
defining response headers on state
response_headers.rb instead of headers_decorator.rb
adding specs for serialized headers
to_h to to_hash
formatting refactoring based on comments
fixing issue in media_type
response_headers into response_headers_decorator
refactoring transition_decorator and state: state creates ResponseHeaderDecorator obj
call to_media_type first on serializer; assign response headers after
Merge pull request #133 from mdsol/serializing_headers

serialization headers support