mrinterweb/grouped_time_zones — pull request #2 by jrmyward (2013-06-20 21:42:10+00:00)
Title: Feature - Allow list options to only have unique values

Added ability to force a unique list of timezones based on the tzinfo indentifier attribute.

Basically, this prevents multiple time zone values from appearing as select options. Example: "Pacific/Midway" would only appear once.