Mkpassphrase

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* update CHANGES to reflect 2.0.0 changes (no code changes compared v2.0.0)

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* support using (bundled) `EFF wordlists`_ as the source for words, in addition to
user-provided wordlists, with the default behavior now being to use the
long EFF wordlist (7,776 words)
* support specifying security level to get a passphrase with the required number of
words for that security level (e.g., `mkpassphrase -s 80` to get a passphrase
with enough words from the default EFF wordlist for 80 bits of entropy)
* removed `--min` and `--max` options for ignoring words in a wordlist that are
too short or too long
* removed `--non-ascii` option for ignoring words that have non-ascii characters

.. _EFF wordlists: https://www.eff.org/deeplinks/2016/07/new-wordlists-random-passphrases

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* 1.0 bump, and change to 'stable'
* python3 support is limited to 3.2.5+ (python2.7 still supported)
* added testing against python-3.6 (alpha3 currently)

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* minor adjustments to python2/3 compatibility checks
* pep257 docstring updates

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* much faster generation of multiple passphrases using `-t`
* minor verbiage tweaks for non-quiet output

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* use cryptographically secure pseudo-random number generator if available
* added standard imports to help with python2/3 compatibility