GitLab

Created by: cwjenkins

Hello, I was curious why you don't allow the same deploy key for multiple projects? I'm half way through implementing this ability, but thought it might be wise to ask if you'd even accept this PR before I complete it.

I have 4 projects in gitlabhq, I have the same 4 projects in gitlab-ci, it seems to be logical to use the same pub key from gitlab-ci for all four projects in gitlabhq. Of course I could create a separate key for each project, but I don't see the reason too.

Thanks for any feedback.