Updated Favicon

Per #11 discussion, included new favicon.ico, Windows 8 tile, and iOS home page images. The Win8 tile and iOS images are distinct even though they are the same size (Win 8 is transparent, iOS is not).

I've checked the iOS images on an iPad 2 since that's what I had around. If someone with a retina device wants to check, I've got this version up at http://kenstonetestwdc.azurewebsites.net/ for review.

Win 8 tile tested. 

Also, I changed the link for the favicon generator. I didn't like the previous one and used the new link to generate the favicon for this update.