Revert student selector changes
Update the value label of some chart

The FirstAid correct answer chart rows now show the number of correct answer compared to total number of questions answered.

However, it is show as #/#, e.g., 3/7 for 3 correct answered out of 7 question answered. It not not very clear what it means.
Merge pull request #70 from dinoboff/live-data

Live data