Pyzipcode

- updated to work with py3
[David Schneider]

1.0 (2016-01-20)

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- Fix import code so that it is not run when the module is imported (for
example, when building Sphinx API Documentation).
- Rename the import.py module to import_zipcode.py because `import` is a
reserved Python keyword.
- Document the import_zipcode module.

0.4

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- updated to use maxmind database http://www.maxmind.com/app/postalcode

- now also keeps timezone and dst values

- longitude and latitude is now contains negative numbers

- use strings instead of integer for storing zip codes since zip codes can start
with a Zero.

- catch sqlite db file reading errors and keep trying in case
another process is trying to access the file at the same time.

- initial release