def sign!(request, token = nil, request_options = {})
      request.oauth!(http, self, token, options.merge(request_options))
    end
def sign!(request, token = nil, request_options = {})
      request.oauth!(http, self, token, options.merge(request_options))
    end
Sign the Request object. Use this if you have an externally generated http request object you want to sign.