Initial commit of CalendarHandler utility. Currently implements two static
methods: isInPast(Calendar) and isInFuture(Calendar).
Added a date formatting method - returns a String representing the given
Calendar in the format "dd/MM/yy HH:mm" (see SimpleDateFormat for pattern
letter definitions).
Corrected error in import line
Moved the location of this utility class into main project package (as
opposed to subpackage). There is some problem with the class path when
doing this outside of an IDE which I don't fully understand, and don't
want to spend time trying to work this out now!