Risclog.sqlalchemy

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- Moved the project to bitbucket.org and prepared for public release.

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- Adjust test dependency for external projects, so pyramid is not required.
(1458)

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- Do not truncate `spatial_ref_sys` when emptying entire database. (13144)

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- Do not truncate `alembic_versions` when emptying entire database (using
`db.empty(engine)`)

- Fix create_defaults, so it can be used with multiple engines. (1172)

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- Fixed setup.py

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- Allow ``.db.Database.empty()`` to not restart sequences. (This can be
necassary if the user is not allowed to call `ALTER SEQUENCE`.)

- Create factory for JSON renderer, so it can be customized via arguments.
(1037)