Sqla-yaml-fixtures

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- support to load custom fixtures with a custom model method
- use method `from_fixtures` if it exists to load model

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- convert module to package
- add cmd line program

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- Support nested list of objects

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- Fix reporting error when model entry cotains more then one mapper
- Accept nested objects without a `backref`

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- `load()` returns a Store instance

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- Python 2 compat (issue 1)
- Top-level YAML must be sequence (i.s.o. mapping) (issue 2)
- Improve error messages (issue 4)