title: Propel 1.5 How to make join with OR condition
body: <p>I need to generate such SQL using Propel build criteria:</p>
  
  <pre><code>"SELECT * 
  FROM  `table1` 
  LEFT JOIN table2 ON ( table1.OBJECT_ID = table2.ID ) 
  LEFT JOIN table3 ON ( table1.OBJECT_ID = table3.ID ) 
  LEFT JOIN table4 ON ( table4.USER_ID = table2.ID
  OR table4.USER_ID = table3.AUTHOR_ID )"
  </code></pre>
  
  <p>Is it possible to make join with or condition? Or maybe some other ways?
  Propel 1.5</p>