Added support for LaTeX rendering
. Anyone can now include LaTeX code in any page or
article that they create. Pelican will take care of
rendering LaTeX properly.
Merge pull request #10 from ohmar/source

Tested with below code, works great, thanks Omar!

```
$\begin{equation}
\left[
{\bf X} + {\rm a} \ \geq\ 
\underline{\hat a} \sum_i^N \lim_{x \rightarrow k} \delta C
\right]
\end{equation}$
```
Makefile make post update