This is lovely! Nice work GitHub team. :)
Can someone explain this to me like I'm 5 years old. What is this?
It's a package (that will eventually come baked in as default) for the Atom text editor that allows you to talk to Github (or projects on Github) without ever leaving the program or typing commands in the terminal.
It's available in Beta https://atom.io/beta
I've been using git-plus for a while in Atom which is very convenient, but this looks much better.