switch gitlab-shell to correct version

a gitlab:check does say that you need v1.1.0 of gitlab-shell...
Merge pull request #3441 from Finkregh/patch-2

switch gitlab-shell to correct version
Use latest gitlab-grit fork to prevent gollum override gitlab-grit. Fixes issues related to gpg signed commits and other fixes from gitlab/grit fork
fix gollum
5.0.1
fix resicpes to point 5-0-stable branch
Fixed check.rake due to #3530
Merge pull request #3535 from boldt/5-0-stable

Fixed check.rake due to #3530
Add a safe migration mode to the wiki migrator.

The safe migrate mode can be invoked by setting the
safe_migrate environment variable to 'true' on the command
line when running the task.

RAILS_ENV=production rake gitlab:wiki:migrate
Ensure old revisions are retrieved from the DB in the correct order.
Merge pull request #3719 from DanKnox/add_safe_wiki_migration

Add a safe migration mode to the wiki migrator.