Control to Github organisation

Github organisation "diaspora" contains the members who can maintain the issues and the Diaspora repositories. This means these members can accept pull requests to Diaspora code base.

We need a way to control who gets chosen to this list of persons and make sure that the amount of people stays limited but still that there are enough people to make issues and pulls flow nicely.

This discussion is about how to handle membership to the Diaspora code repository.