Implemented tests

Implemented getFutureMeetingList tests. Implemented addNewPastMeeting.
Implemented testsGetPastMeetingList
Implemented tests for AddMeeting Notes

Also exception tests for same method
Added more exception tests
Added Comparator to MeetingImpl

added another exception test
Changes in the way contacts are used in tests

Instead of passing new contact objects and testing properties, I am now testing against the objects themselves.
Implemented getPastMeetingList

both methods implemented.
Added addMeetingNotes Implementation

Also corrections to testing
Implemented flush()

Also required creating setters and getters in all the custom objects.
Completed testing for XML Serialization