让Jekyll支持Latex

<!-- MathJax Section -->
<script type="text/javascript"
src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
<script>
    MathJax.Hub.Config({
          tex2jax: {
          skipTags: ['script', 'noscript', 'style', 'textarea', 'pre']
          }
    });
    MathJax.Hub.Queue(function() {
        var all = MathJax.Hub.getAllJax(), i;
        for(i=0; i < all.length; i += 1) {
            all[i].SourceElement().parentNode.className += ' has-jax';
        }
    });
</script>

body div.content {}
    body div.content code.has-jax {
        font: inherit;
        font-size: 100%;
        background: inherit;
        border: inherit;
        color: #000000;
    }