title: SQLAlchemy returns tuple not dictionary
body: <p>I've updated SQLAlchemy to 0.6 but it broke everything. I've noticed it returns tuple not a dictionary anymore. Here's a sample query:</p>
  
  <pre><code>query = session.query(User.id, User.username, User.email).filter(and_(User.id == id, User.username == username)).limit(1)
  result = session.execute(query).fetchone()
  </code></pre>
  
  <p>This piece of code used to return a dictionary in 0.5.</p>
  
  <p>My question is how can I return a dictionary?</p>