Merge branch 'feat/relayLogout' into dev
Merge branch 'EVENT-45' into dev
Use class instead of enum for `ConferenceTimezone`
 - enums are too tricky since the web client wants the America/New_York value instead of EASTERN
 - using an enum would mean lots of extra code for String -> enum -> String both at the DB and Jackson layer
 - this solution is more streamlined
Merge branch 'EVENT-45' into dev

Conflicts:
	src/main/java/org/cru/crs/api/model/conference/ConferenceTimezone.java
	src/main/java/org/cru/crs/api/process/CreateConferenceProcess.java
git didn't merge correctly..
git screwed up the merge again
In confirmation email, make sure event time is in the right timezone
move validation logic for timezone code
 - again into the setter for Conference.eventTimezone
 - delete class `ConferenceTimezone`, `DateTimeZone` handles it better
 - cleanup broken imports