title: MongoDB create collection failure
body: <p>I am trying to<br/><br/>
  1. Create a database</p>
  
  <pre><code>use testdb switched to db testdb
  </code></pre>
  
  <p>2. Create collection</p>
  
  <pre><code>testdb.createCollection(testcollection)
  </code></pre>
  
  <p>I am getting following error:</p>
  
  <pre><code>2015-05-12T11:21:19.619-0700 E QUERY    ReferenceError: testdb is not defined
      at (shell):1:1
  </code></pre>