Pgdata

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- rename module to avoid collisions with existing pgdb on pypi

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- tests and travis-ci integration fixed
- fix 8, 9
- enable parallel loads
- enable creating databases

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- use only SQLAlchemy engine for connections
- add `ogr2pg` and `pg2ogr` ogr2ogr shortcuts

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- support Python 3 (2)
- modify packaging to support testing via tox and Travis CI