time_zone.rb data corrections

There is no Gerogetown city in Argentina, and there is no San Juan time zone in Argentina (although there is a San Juan province and its capital city is also called San Juan). So the options are to either fully remove that entry, or try to figure out what the authors meant. I did a search for Georgetown, and there is only one major city name Georgetown in South America, the capital of Guyana, which has no named equivalent in the time zone database. Also in the reference below you will find that the time zones are names continent/city, not continent/country/city, so America/Argentina/Buenos_Aires is invalid, while America/Buenos_Aires is a valid entry. References: http://twiki.org/cgi-bin/xtra/tz.... I will re-submit as two separate changes in order to keep the discussion separate.

Re Georgetown -- see my comments on http://rails.lighthouseapp.com/p...

Re America/Argentina/Buenos_Aires -- see the naming scheme of the TZInfo gem -- http://rubyforge.org/projects/tz... -- this is a valid name for how this gem retrieves zones (which is what the TimeZone::MAPPING values are used for.)

As far as America/Argentina/Buenos_Aires being a legit Olson name, afaik three-level names are legit, they're just not as common as two-level names.

From Wikipedia:

"In a few rare cases the Location is itself represented as a compound name, for example the time zone “America/Indiana/Indianapolis”. The only three-level names currently include those under “America/Argentina/…”, “America/Kentucky/…”, “America/Indiana/…”, and “America/North_Dakota/…”."

http://en.wikipedia.org/wiki/Zon...