Hours per week label

I added an "hours per week label" to the schedule page UI. I figured this would give students an easier and more accurate method of counting up their weekly hours rather than doing it manually. 

Here is a screenshot of the changes I made to the UI:
![newui](https://cloud.githubusercontent.com/assets/6456601/4179941/768239c4-36dd-11e4-9b65-c5f656a19971.png)

`font-weight: 350` is the same as `font-weight: 400` because we have a 300 font weight glyph and a 400 font weight glyph. You should notice that setting this to any intermediate values between 300 and 400 just renders either 300 or 400.