Added a exception to addFutureMeeting that checks all contacts exist
Updated the test for addFutureMeeting to check the test for all contacts
is working.  A new test was added to test the contact exception
Updated a number of tests to comply with the new exception for missing
contacts when adding a meeting
Added an exception for a missing contact to getFutureMeetingList
Created a test for getFutureMeetingList by contact
Added a test to check that the correct exception is thrown when getting a
list of future meetings where the contact does not exist
Added a test to check that getPastMeetingList throws an exception if the
contact does not exist
Added a test for getPastMeetingList
Moved an exception to the first line in a method