title: Create directory with Cordova FileWriter
body: <p>I want to safe a file in a new directory with PhoneGap and filewriter.
  I have this code:</p>
  
  <pre><code>fileName = fileSystem.root.fullPath+"/test.html";
  var writer = new FileWriter(fileName);
  writer.write("ttteeeesssttttt", false);
  </code></pre>
  
  <p>With this I can create the test.html file and it works.
  But when I change the path to:</p>
  
  <pre><code> fileName = fileSystem.root.fullPath+"/test/test.html";
  </code></pre>
  
  <p>it doesn't work....</p>
  
  <p>is there a simple way to solve this problem or should i create the directory first in an other function?</p>
  
  <p>thank you! :)</p>