Setup for cabal and markdown

I want to use `cabal sandbox’ to build my site.hs, so setup it refer to following URL.

http://nothingdoing.ui3.info/posts/2013-02-19-HakyllCabalDevProcedure.html

I also setup mathjax. I refer the following.

http://hiyokoz.blogspot.jp/2013/03/hakyllmathjax.html

These are mathjax samples :)

\[\frac{1}{\sqrt{2\pi}\sigma}\int_{-\infty}^{\infty} \exp \left\{-\frac{(x-\mu)^2}{2\sigma^2}\right\}\]