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)

Instead of `isSame`, I'd use `isBefore` [instead](http://momentjs.com/docs/#/query/is-before/). This way we won't have to compute the day after the end date. Something like:
```
while (curDay.isBefore(endDay, 'year')) {
    // Loop body and unicorns
}
```