Tzlocal

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- Ensure closing of subprocess on OS X (ayalash)

- Removed unused imports (jwilk)

- Closes stdout and stderr to get rid of ResourceWarnings (johnwquarles)

- Updated Windows timezones (axil)

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- 34: Added support for /var/db/zoneinfo

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- 30: Fixed a bug on OS X.

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- Tests failed if TZ was set in the environment. (EdwardBetts)

- Replaces os.popen() with subprocess.Popen() for OS X to
handle when systemsetup doesn't exist. (mckabi, cewing)

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- Systemd stores no time zone name, forcing us to look at the name of the file
that localtime symlinks to. (cameris)

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- Timezones that has 3 items did not work on Mac OS X.
(Marc Van Olmen)

- Now doesn't fail if the TZ environment variable isn't an Olsen time zone.

- Some timezones on Windows can apparently be empty (perhaps the are deleted).
Now these are ignored.
(Xiaokun Zhu)