[templates] Update gitlab init.d file (s/gitlab/git), use 5.0 gitlab.yml/unicorn.rb config files
[exmaples] Add gitlab domain, and clean olds files
[init] Correct gitlabshell sources, and update parameters infos
[server] Remove old ssh key depends (gitolite)
[doc] Update readme (tested on debian wheezy)
Adding changes that are specific to Ubuntu Precise.