[WCP-130] Converting Delete Moderators functionality to use a form bean with jsr303 validation.  Adding null checking to ConferenceUserDisplayNameComparator.
[WCP-130] Converting Add and Delete Participants functionality to use a form bean with jsr303 validation.
[WCP-88] Fixing startHour and endHour validations so that they use 24 hour times instead of 12
Merge remote-tracking branch 'origin/uw-master' into uw-master