Add LaTeX highlighting

Added a new highlighting mode from LaTeX which understands
commands, inline math and comments. It's a very simple parser, but
it doesn't understand comments inside inline math and it doesn't
do anything complicated with command arguments.

kitchen-sink.html

@@ -36,6 +36,7 @@
           <option value="textile">Textile</option>
           <option value="groovy">Groovy</option>
           <option value="scala">Scala</option>
+          <option value="latex">LaTeX</option>
         </select>
       </td>
     </tr>
@@ -65,6 +66,7 @@
           <option value="textile">Textile</option>
           <option value="groovy">Groovy</option>
           <option value="scala">Scala</option>
+          <option value="latex">LaTeX</option>
         </select>
       </td>
     </tr>
@@ -683,6 +685,29 @@ object implicits extends Application {
   val x = Array(2, 3, 1, 4)
   println("x = "+ x.sort((x: Int, y: Int) => x < y))
 }</script>
+<script type="text/editor" id="latex">\usepackage{amsmath}
+\title{\LaTeX}
+\date{}
+\begin{document}
+  \maketitle
+  \LaTeX{} is a document preparation system for the \TeX{}
+  typesetting program. It offers programmable desktop publishing
+  features and extensive facilities for automating most aspects of
+  typesetting and desktop publishing, including numbering and
+  cross-referencing, tables and figures, page layout, bibliographies,
+  and much more. \LaTeX{} was originally written in 1984 by Leslie
+  Lamport and has become the dominant method for using \TeX; few
+  people write in plain \TeX{} anymore. The current version  is
+  \LaTeXe.
+ 
+  % This is a comment; it will not be shown in the final output.
+  % The following shows a little of the typesetting power of LaTeX:
+  \begin{align}
+    E &= mc^2                              \\
+    m &= \frac{m_0}{\sqrt{1-\frac{v^2}{c^2}}}
+  \end{align}
+\end{document}
+</script>
   <input id="cockpitInput" type="text"/>
 
 <!-- DEVEL-->