Added the following DAOs:
ClassDAO / CourseDAO / EnrolledDAO / StudentDAO
Amended the createClass.java to link up to the various DAOs
Updated the createclass.jsp

Signed-off-by: xylim2011 <xylim.2011@sis.smu.edu.sg>
Committing again due to failed commits earlier
Committing .prefs file with createclass.jsp parameter included.