Just thought I'd share this tip with any Mod authors using GitHub. There's a great open source text editor I use, called Atom. With Atom, you can install different code linters and cool extensions from within the editor. Anyways, today I discovered that Atom has a RM previewer. After the package is installed all one has to do is press "cntrl - shift - M" and a second tab opens showing you a GitHub preview of your markdown like so:
Here's the link to the package if you're interested. Link
Just thought I'd share this incase anyone didn't know, I know it made my life easier