* [contrib/timezone-gen] Move timezone-gen.pl to own folder
* [contrib/timezone-gen] Add fixTzstr
* [contrib/timezone-gen] Add tests and zone data getter
- tests.pl can be used to verify that the generated timezone conf
will produce the correct datetimes by testing them against
what the system's `date` says
- build-zonedata.pl will download the latest tzdb data and build
the posix timezone data files. It only builds what is needed
rather than adding extraneous "right/" and "posix/" timezones.
FreeSWITCH doesn't seem to be able to use the "right/"
timezone files.
- data/ is where the various files needed to generate the
timezones gets stored
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