Ticket #131

- Implemented a more user friendly date time picker with the bootstrap
library
- We are now not using a datetimepicker component but separate
datepicker and timepicker. The models are combined when the form is
submitted.
- I have implemented some simple css to move the two components closer
together
        - the answer/comparison periods start and end dates are now
        horizontally aligned instead of vertically aligned
- timepicker - turned off mousewheel option - now users cannot change
the time by scrolling their mouse - minimize error/unexpected results
- datepicker - format = dd-MMMM-yyyy - eg. 14-December-2014
        - can be changed
fixed TAs unable to see students' full names