title: sequelize fetching associations on find (1.6)
body: <p>sequelize 1.6 has the following in the changelog:</p>
  
  <blockquote>
    <p>[FEATURE] added association prefetching for find and findAll</p>
  </blockquote>
  
  <p>The question is HOW? </p>
  
  <p>I have the following models defined:</p>
  
  <pre><code>var self = {
      Medium: client.define("Medium", {
          name: Sequelize.STRING,
          description: Sequelize.TEXT
      },
  
      User: client.define("User", {
          firstName: Sequelize.STRING,
          lastName: Sequelize.STRING,
          email: Sequelize.STRING,
          aboutArt: Sequelize.TEXT,
          bio: Sequelize.TEXT,
          password: Sequelize.STRING,
          description: Sequelize.TEXT
      }
  };
  self.User.hasMany(self.Medium, { as: 'Media' });
  self.Medium.hasMany(self.User);
  
  for(var key in self){
      var model = self[key];
      model.sync();
  }
  </code></pre>
  
  <p>later when i fetch a user like this:</p>
  
  <pre><code> User.find(id)
      .success(function(record) {
          //record has no media!
      })
  </code></pre>
  
  <p>the User instance does not have a list media. How do i auto fetch associations?</p>