add Gaussian process simulation

Just polished up my Gaussian process code and decided to go overboard. I used the [animation](http://cran.revolutionanalytics.com/web/packages/animation/index.html) package to make animated GIFs demonstrating the effects of each parameter.

Run the script and it'll dump three GIFs in your working directory (b.gif, t1.gif, and t2.gif) which show the results.

Now I should probably get back to other work...