Non-interactive AWS install by running a single script.

Merge branch 'master' into non-interactive-aws-install

Conflicts:
	doc/installation.md

Fix merge mess in installation.md

lib/tasks/gitlab/enable_automerge.rake

@@ -2,9 +2,7 @@ namespace :gitlab do
   namespace :app do
     desc "GITLAB | Enable auto merge"
     task :enable_automerge => :environment  do
-      Gitlab::GitHost.system.new.configure do |git|
-        git.admin_all_repo
-      end
+      Gitlab::Gitolite.new.enable_automerge
 
       Project.find_each do |project|
         if project.repo_exists? && !project.satellite.exists?