title: Monaco Editor 'onChange' event?
body: <p>I've just started investigating Monaco to be used as the editor for our internal code playground.  And I'm unable to figure out how to create a handler for whenever the text in the editor window is changed, either by typing, pasting, or deleting.  For context, using the CodeMirror editor, I simply did:</p>
  
  <pre><code>editor.on('change', function(editor, change) {
      render();
  });
  </code></pre>
  
  <p>Here is my JavaScript that creates the basic editor:</p>
  
  <pre><code>    require.config({ paths: { 'vs': '../node_modules/monaco-editor/min/vs' }});
  require(['vs/editor/editor.main'], function() 
  {
      window.editor = monaco.editor.create(document.getElementById('editor'),                 
      {
          value: [
              'var canvas = document.getElementById("playground");',
              'var ctx = canvas.getContext("2d");',
              'ctx.fillStyle = "#FF00FF";',
              'ctx.fillRect(0,0,150,75);',
          ].join('\n'),
          language: 'javascript'
      });
  });
  </code></pre>
  
  <p>Thanks!</p>