Mkpassphrase

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* added -t|--times N to allow generating multiple passphrases w/ one command

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* include CHANGES.rst and README.rst in sdist via MANIFEST.in

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* cosmetic changes for better PyPI display

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* cosmetic changes for better PyPI display

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* cosmetic changes for better PyPI display

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* added -q option to omit extra information about how many unique candidate
words were found and how many passphrases were possible
* fix for --ascii option not being used, and improved encoding handling
* start documenting changes in CHANGES.rst
* use README and CHANGES as long_description for improved pypi info