Mode Runner Demo
Running a CodeMirror mode outside of the editor.
    The CodeMirror.runMode function, defined
    in addon/runmode/runmode.js takes the following arguments:
text (string)- The document to run through the highlighter.
 mode (mode spec)- The mode to use (must be loaded as normal).
 output (function or DOM node)- If this is a function, it will be called for each token with
      two arguments, the token's text and the token's style class (may
      be 
nullfor unstyled tokens). If it is a DOM node, the tokens will be converted tospanelements as in an editor, and inserted into the node (throughinnerHTML). 
