title: Apigee Usergrid: Mass delete option missing
body: <p>I am using usergrid to store data for a customer project. It's got two collections carShowrooms and cars. So far I am good. But I have a scenario where I have refresh the masterdata of the collection cars. Everytime I do this, I have to delete all the existing data in cars and replace it with incoming cars data from the master inventory system.</p>
  
  <p>Now, with the docu in  <a href="https://www.npmjs.org/package/usergrid" rel="nofollow">https://www.npmjs.org/package/usergrid</a>, I see that I can only destroy one car at a time.</p>
  
  <pre><code>car.destroy(function(err){
      if (err){
          //error - car not deleted
          //winston log - tbd
      } else {
          //success - car deleted
      }
  });
  </code></pre>
  
  <p>This is ok for smaller showrooms, but bigger multibrand showrooms have variety of cars - sometimes even upto 50 different varieties (8 car brands * approx. 8 different options).</p>
  
  <p>Is there a mass delete option?  can someone please point me to a docu if I am missing something here.</p>
  
  <p>P.S. I am new to usergrid, if this is a repeated question, please mark so and point me to the right url</p>