Fix RoutingError when changing username to non ascii char.

Changed the word 'authentification' to 'authentication'

fix typo: shure -> sure

Fixed UsersProject.in_projects

Fixed: gitlab-shell version check error message

Removing duplication by putting everything in the readme. Allow us to close issues that deviate from the guidelines.

Prevent gollum to overrride gitlab-grit gem. Use grit as instead so gollum uses it too. Fixes things with gpg singatured commits, etc.

This reverts commit 4524ba20.

use convenient method to check for empty project repo