Node program that calculates mean, median, and mode.

![yep](http://i.imgur.com/6ADLV4r.gif)

Takes a series of numbers as command-line arguments.
Assumes multiple modes are possible
(http://en.wikipedia.org/wiki/Mode_(statistics)).
If all inputes are unique, all are modes.
try to avoid syntax like this, it's frowned upon in the javascript community. Either use brackets or put it on a single line.