Rebuilt the reservation database and added the properties file for the
reservation database.
Modified the DB_Interface to be more general so that it can interface
both with the Stub database and the HSQLDB.
Modified to return to obtain the results from the Database class.
Created the Database class which accesses the HSQLDB.
There are errors in these due to the updated DB_Interface. Committing in
to fix later on.
Merge branch 'master' of git@github.com:COMP-3350-Group-6/Project.git

Conflicts:
	AirlineReservationSystem/src/tests/persistenceTest/StubTest.java