Fixing spec warnings

spec/google/api_client/media_spec.rb

@@ -173,7 +173,7 @@ describe Google::APIClient::ResumableUpload do
 
   def mock_result(status, headers = {})
     reference = Google::APIClient::Reference.new(:api_method => @drive.files.insert)
-    stub('result', :status => status, :headers => headers, :reference => reference)
+    double('result', :status => status, :headers => headers, :reference => reference)
   end
 
 end

spec/google/api_client/result_spec.rb

@@ -34,8 +34,8 @@ describe Google::APIClient::Result do
       })
       @request = @reference.to_http_request
 
-      # Response stub
-      @response = stub("response")
+      # Response double
+      @response = double("response")
       @response.stub(:status).and_return(200)
       @response.stub(:headers).and_return({
         'etag' => '12345',