Risclog.sqlalchemy

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- Add compatibility to `pypy`.

Also removed explicit dependency to `psycopg2` as it's a PostgreSQL specific
dependency and not compatible with pypy. You will need `psycopg2cffi` in
order to run `risclog.sqlalchemy` with `pypy`.

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- Removed ``RoutingSession.using_bind``, require SQLAlchemy >= 1.0. (13968)

- Updated API calls to alembic, require alembic >= 0.7. (13968)

- Added documentation. (13952)

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- Officially supporting Python 3.3 up to 3.5.

- Set maximum supported version numbers of ``alembic`` and ``SQLALchemy``
in `setup.py`

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- Fix bug in testing mode detection so it works with sqlite, too.

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- Have ``.model.Object.create`` use the ``**kw`` constructor instead of
performing setattr itself.

- Made commit in db.empty optional.

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- Make test setup/teardown a bit more independent from the IDatabase utility.
- Made pyramid dependent code optional, because it is an optional requirement.