title: make custom queries using sequelizejs
body: <p>I am using sequelizejs orm in my nodejs app. And I dont have its documentation mentioning how to make custom sql queries. I found an example by googling but couldnt understand its syntax. and what the role of this callee function. </p>
  
  <pre><code>  var callee = {
                      build: function(result, config) {
                          console.log("callee", result);
                      }
                  };
                  sequelize.query("SELECT * from Users", callee).on("success", function(){
                      console.log("success");
  
                  });
  </code></pre>