title: Gitlab: team member project access levels
body: <p>GitLab offers the project access levels "Guest", "Reporter", "Developer" and "Master" for "team members" co-operating with a specific project. </p>
  
  <p>"Master" and "Guest" are self-explanatory, but the others aren't quite clear to me, in their extents as well as in their granularity. What is the difference between these levels?</p>