Add lectures using reveal.js!

Groups lectures by year, then by semester. Allows you to create lecture notes using reveal js. Has sample lecture material in the first lecture (/lectures/1)

![screen shot 2014-03-20 at 8 23 41 pm](https://f.cloud.github.com/assets/1435378/2479963/49618856-b0a9-11e3-90b3-8d6b72c0e1c8.png)