Minor modifications. Removed verifyDetails()
Very minor - updated description.
Created EventTimeInterval.class.php

EventTimeInterval models the start and end times of an event. It will
do the validation instead of the Event object.
Oops
Fixed a horrible mistake

Accidentally deleted four class files, so I've fixed that.
Corrected some capitalisation
Updated Event class to use EventTimeInterval
Filled out lib/EventLocation.class.php