title: Postgres versions are not compatible
body: <p>I'm having trouble starting postgres as you can see below:</p>
  
  <pre><code>$ pg_ctl -D /usr/local/var/postgres start
  server starting
  FATAL:  database files are incompatible with server
  DETAIL:  The data directory was initialized by PostgreSQL version 9.1, which is not compatible with this version 9.3.0.
  </code></pre>
  
  <p>Anyone know how to make the versions compatible?</p>