Hashsum

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* Improved compatibility with the OpenSSL command line tool
* Better iteration on data blocks
* Optional threaded hash computation
* Refactoring: the entire code has been re-organized in tools
* Drop all `gettext` related files

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* Include man pages in the tarball

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* Fixed IncrementalNewlineDecoder.decoder signature
* Always call decode with final=True when reading in text mode
* Factorized code for checksum computation
* All `Exceptions` are now trapped in the `main` function
* Added unit testing
* Code cleanup
* Added `NEWS.rst` file
* Added man page
* Improved command line help (also fixed some typos)
* Enabled automatic testing with travis-ci

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* Initial release