Gocept.testdb

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- Added option to specify the encoding for the PostgreSQL database.

- Updated PostgreSQL protocol from ``postgres:`` to ``postgresql:`` as the
former one is deprecated in SQLAlchemy 0.6, thus requiring atleast version
0.5.6 of SQLAlchemy.

- Added documentation how to develop this package further.

- Added doumentation about usage of `Database prefix`.

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- PostgreSQL: Don't call createdb/dropdb with ``--quite`` but only psql.

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- implemented authentication with password for mysql.
Passwords for postgres are still not supported, though.

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- first release