Server - Add downloading from ArcGIS Server WFS

Hi Chris,

I have sent a pull request to your version2_0 branch. I was coding based on your Jan 15th, 2014 version and did not follow your update. As a result, as you could see, there are a lot "Empty File Added" changes. However, I checked couple of those files but find no differences comparing to your latest version. What does those mean? 
Allen