MathJax support for rendering matrices

I just found MathJax, a js library to render LaTeX. So I wrote a method to convert your matrices to latex and added a function to print them in index.html.
![example](https://f.cloud.github.com/assets/5544859/1947305/7cefe1e6-804c-11e3-8137-0b83581f870b.JPG)

I also fixed the createCopy() method (missing this.). BTW, I'd rename createCopy to clone. Sounds better and is shorter.