Updated codemirror to v4.12.

Did a lot of cleanup to limit the size of the plugin.
I kept the emmet plugin.

applications/admin/static/codemirror/mode/coffeescript/index.html

@@ -9,12 +9,12 @@
 <script src="coffeescript.js"></script>
 <style>.CodeMirror {border-top: 1px solid silver; border-bottom: 1px solid silver;}</style>
 <div id=nav>
-  <a href="http://codemirror.net"><img id=logo src="../../doc/logo.png"></a>
+  <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
 
   <ul>
     <li><a href="../../index.html">Home</a>
     <li><a href="../../doc/manual.html">Manual</a>
-    <li><a href="https://github.com/marijnh/codemirror">Code</a>
+    <li><a href="https://github.com/codemirror/codemirror">Code</a>
   </ul>
   <ul>
     <li><a href="../index.html">Language modes</a>
@@ -735,6 +735,6 @@ wrapper::value = -> this._wrapped
 
     <p><strong>MIME types defined:</strong> <code>text/x-coffeescript</code>.</p>
 
-    <p>The CoffeeScript mode was written by Jeff Pickhardt (<a href="LICENSE">license</a>).</p>
+    <p>The CoffeeScript mode was written by Jeff Pickhardt.</p>
 
   </article>