Giving it a try!

Just a couple of notes, I was getting some JSCS errors for not joining var declarations..I am not sure how big of a deal this is.

Also, there seems to be some minor spelling and formatting errors in test/mean_median_mode_tests.js.  Also, the parameters passed into median and mode were not passed in an array (I wasn't sure if this was on purpose or not, but I fixed it on my fork)

Let me know what you think, I wanted to submit this early if I could!