title: Show line errors in codemirror?
body: <p>I just upgraded CodeMirror to latest and have the following code now breaking:</p>
  
  <pre><code>        // clear previous errors from editor window
          for (var i = 0; i &lt; layoutCodeEditor.lineCount(); i++) {
              layoutCodeEditor.clearMarker(i);
              layoutCodeEditor.setLineClass(i, null, null);
          }
  
          var valid = JSLINT(code);
          var jsLintError = "";
          if (!valid) {
              jsLintError = JSLINT.error_report(JSLINT.data());
              _.chain(JSLINT.errors).compact().each(function(e){
                  // show markers in the code edit window against lines with Jslint errors
                  layoutCodeEditor.setMarker((+e.line) - 1, "●", "errors");
                  layoutCodeEditor.setLineClass(+(e.line) - 1, null, "errorLine");                    
              })
          }
  </code></pre>
  
  <p>seems like the setMarker/clearMarker and setLineClass functions have been removed. What's their equivalents now?</p>