adding subtome

Anthony, it's important to make sure people can follow your blog using the feed reader they like without having to copy and paste urls. [SubToMe](https://www.subtome.com/#/) is a simple follow button for the open web. It's open and decentralized too!

This won't scale for me, but I'm adding the button to my friends blogs, so I can follow them more easily :) 
Let me know what you think. If you want to look at it before merging, check http://blog.superfeedr.com/

Since it's just HTML, you can of course customize it to fit your style :)