This commit includes interface implementations with method stubs and test classes with empty test stubs
added required fields and a constructor to the implementation
created failing tests for ContactImpl class
added code to make the tests pass for each method
all tests on Contact have passed(green)
created tests which fail for MeetingImpl.java
added code to pass the tests
all tests passed except for getMeetingContacts-needs to be fixed
Implemented PastMeeting-added fields, constructor and enough code to pass the test
Past meeting extends MeetingImpl to re-use the majority of the methods
tests for PastMeetingImpl