Fallback behavior for when there's no internet connection

[arnavs]

In this case, if you try activating master, I think it'll just fail. Better would be to check for this and gracefully it (i.e., print something like "you don't have an internet connection; using the master currently on your machine.")

[jlperla]

I think a more graceful warnings should be done, but no point in doing it until #21 since that may change the workflow of it.

[arnavs]

Good point