Diceware

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- Minor doc changes: add separate config file docs.
- Fix docs: the default wordlist is named ``en``. Some docs were not
up-to-date in that regard.

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- Officially support Python 3.5.
- Tests do not depend on `pytest-cov`, `pytest-xdist` anymore.
- Support configuration files. You can set different defaults in a
file called ``.diceware.ini`` in your home directory.
- Renamed wordlist ``en_8k`` to ``en`` as it serves as the default
for english passphrases.

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- New option ``-r``, ``--randomsource``. We support a pluggable system
to define alternative sources of randomness. Currently supported
sources: ``"system"`` (to retrieve randomness from standard library,
default) and ``realdice``, which allows use of real dice.
- New option ``-w``, ``--wordlist``. We now provide several wordlists
for users to choose from. Own wordlists could already be fed to
`diceware` before. By default we still use the 8192 words list from
http://diceware.com.
- Rename `SRC_DIR` to `WORDLISTS_DIR` (reflecting what it stands for).
- Use also flake8 with tox.
- Pass `options` to `get_passphrase()` instead of a bunch of single args.
- Output wordlists dir in help output.

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- Add --delimiter option (thanks to Rodolfo Gouveia).

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- Turned former `diceware` module into a Python package. This is to
fix `bug 1 Wordlists aren't included during installation
<https://github.com/ulif/diceware/issues/1>`_, this time really.
Wordlists will from now on be stored inside the `diceware` package.
Again many thanks to `conorsch <https://github.com/conorsch>`_ who
digged deep into the matter and also came up with a very considerable
solution.
- Use readthedocs theme in docs.

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- Fix `bug 1 Wordlists aren't included during installation
<https://github.com/ulif/diceware/issues/1>`_ . Thanks to `conorsch
<https://github.com/conorsch>`_
- Add --version option.