title: Get tinyMCE content in raw/text format without using active editor
body: <p>I need to have the raw/text format from an tinyMCE editor.</p>
  
  <pre><code>tinyMCE.activeEditor.getContent({format: 'raw'})
  </code></pre>
  
  <p>will do the job, but I have 2 editors in the same page (with different ids of course).</p>
  
  <p>I need to count characters on window.onload, but at this moment i have no editor focused.</p>
  
  <pre><code>tinyMCE.get('my_editor').getContent()
  </code></pre>
  
  <p>can do the job but it doesn't take any parameters to format the output, it only returns html.</p>
  
  <p>How can I get the raw content of a tinyMCE editor by id?</p>