Rlotp

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- Add extended range support to TOTP.verify. Thanks to Zeev Rotshtein (PR 19).
- Handle missing padding of encoded secret. Thanks to Kun Yan (20).
- Miscellaneous fixes.

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- Fix packaging issue in v2.0.0 that prevented installation with easy_install.

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- The ``rlotp.HOTP.at()``, ``rlotp.TOTP.at()``, and
``rlotp.TOTP.now()`` methods now return strings instead of
integers. Thanks to Rohan Dhaimade (PR 16).

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- Begin tracking changes in change log.
- Update documentation.
- Introduce Travis CI integration.

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- Initial release.