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)

Oops, I made two mistakes in the sample code I gave. It should be:
```
while (!curDay.isAfter(endDay, 'day')) {
    // Loop body
}
```
The `'day'` argument will tell `isAfter` to check on a day granularity. We end up having to use a negative condition, but I think it's still more concise.