def beautify_headers(headers)
      headers.inject({}) { |out, (key, value)| out[key.gsub(/-/, '_').downcase.to_sym] = value; out }
    end
def beautify_headers(headers)
      headers.inject({}) { |out, (key, value)| out[key.gsub(/-/, '_').downcase.to_sym] = value; out }
    end
Beautify response header keys so that in same form as RestClient

 @param [Hash] headers from response

 @return [Hash] response headers with keys as lower case symbols