Added another test to ContactTest.java

Testing for empty return on getNotes when there is no note.
Implemented getId() in ContactImpl.java
Implemented getName() in ContactImpl.java
Implemented addNotes() and getNotes

Implementation in ContactImpl.java.
Refactoring and minor formatting

Refactored ContactTest.java to initialise objects. Minor formatting changes in Meeting.java.
Added compareTo method

Added compareTo method in ConactImpl.java to allow ordering of IDs. This allows an unused ID to be created. Also minor formatting in ContactTest.java
Corrected syntax errors
Creating test MeetingTest.java
Modified testsGetContacts

Changed test to check that the contacts set object added to each meeting is the same as what is returned from getContacts()
Completed modification to MeetingTest.java

Modification to correct testsGetDate() method.
Added MeetingImpl.java