Add momentjs

> I looked at moments.js and this appeared to be a library for formatting dates not for doing date comparisons so I have left my dates in day and hour since 1970.

Moment isn't just a date formatter, you have a lot of tool for comparison [Moment Query](http://momentjs.com/docs/#/query/) and manipulation [Moement Manipulate](http://momentjs.com/docs/#/manipulating/).

**PS: this code isn't tested**