Improve precmd/prexec (via title)
Improve precmd/prexec (via title)

 - Add suffix via title, when entered into a OpenVZ container, or inside of
   a container dir (adds (relative) path).
 - Improve handling of jobspec in preexec

blueyed/oh-my-zsh,blueyed/oh-my-zsh,blueyed/oh-my-zsh