Integrate GitHub Status API

[cmfcmf]

https://status.github.com/api

[Guite]

Can you please elaborate about the reasoning of this issue?
Should the CoreManager verify if GitHub is running before doing a release?

[cmfcmf]

I don't remember. Maybe I was rather thinking about the download buttons. If GitHub is down, the downloads won't work. Not a huge deal, of course.