Added Time Taken To Result Details Page

Added a row on the result details page that shows the time the quiz was
taken.
Added Completion Time Column

Added the amount of time user took to finish quiz to table.
Changed Completion Time Output To Minutes & Seconds

Changed the output of completion time to be shown in minutes and seconds
instead of just seconds.
Merge pull request #11 from fpcorso/feature/2

Feature Addition To Resolve #2