title: how do I downgrade salt minion to an older version?
body: <p>I need to use version 0.13.0 instead of version 0.15.x.
  It seems stack overflow requires me to add 
  many lines of text below this line,
  when all I want to ask is a simple question
  on how to down grade salt minion
  can't find any ppa...
  repository that has it or anything...</p>