Added dateValue (DATE) field to histories table. Added functionality to
DAL and User classes to retrieve a Users's recently taken quizzes and
recently created quizzes, limited to 10 each and ordered by dateValue
Updated DBTables
Merge branch 'master' of ssh://github.com/amybear/quiz

Conflicts:
	DBTables.sql
	build/classes/quiz/HistoryObject.class
	build/classes/quiz/User.class
	src/quiz/HistoryObject.java