GitLab

- change to use 4.1 and not 4.1-rc1

-I also added the public Fabric key to the repo, because it seemed there
was no other way. Really hope no one abuses that.

-And it literally took one line in my Gradle setup, that took 30 seconds
to search for. Last time I tried to fix this it took hours of searching
and I never found a solution. I want to die.