title: How to call multiple collections of Keen IO for a single graph?
body: <p>Can I call multiple collections of Keen IO for a single visualization graph?</p>
  
  <p>Let's say I have a collection named <code>orders</code>:</p>
  
  <pre><code>{
    "order_number": "dfdfd2323",
    "order_price": 21.00,
  } 
  </code></pre>
  
  <p>And I have another collection named <code>adjustments</code>:</p>
  
  <pre><code>{
    "adjustment_id": "34ss3432",
    "adjustment_price": 2.00,
  }
  </code></pre>
  
  <p>Now I want to display a bar graph which shows "total order price for every week" and "total adjustment price for every week". Weeks along x-axis and price on y-axis. Orders and adjustment price in different colors.</p>
  
  <p>Can I make a nested call to Keen IO like this?</p>
  
  <pre><code>client.run(query1, function(){
  .....
     client.run(query2, function(){
     }
  }
  </code></pre>