Mortar-rdb

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- Drop support for the ancient SQLAlchemy extension mechanism.

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- Stop passwords showing in logging from
:class:`~mortar_rdb.controlled.Scripts`.

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- More careful password masking.

- Better support for using
:class:`controlled.Scripts` as part of another script framework.

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- Deploy to PyPI using Travis.

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- Drop support for Python 2.6.

- Add support for Python 3.4+.

- Move to Read The Docs for documentation.

- Move to virtualenv and nose for development.

- Move to Travis CI and Coveralls for automated continuous testing.

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- Remove use of :mod:`sqlalchemy-migrate`, :mod:`alembic` is a better
bet but not yet introduced.

- Much work to better adhere to PEP 8, including renaming the major
functions.