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)

I'd want to treat each 20 min/50 min lecture as 30min/60min since that's how most students count their hours manually (and rounded hours is easiest to calculate and makes more sense). If we do this at the end, then we would lose 1-2 hours from the actual amount.