When stopped correctly there should be no warning about a missing socket file.
Make the installation guide easier to follow for non-unix people.
Fix spelling error and make sure you never log in as git user so you never have to logout to run sudo.
Merge branch 'master' into install-guide-improvements

Conflicts:
	doc/install/installation.md
Merge branch 'install-guide-improvements' of /home/git/repositories/gitlab/gitlabhq