Pytest-harvest

Fixed issue happening with python 2 when `unicode_literals` are used in the parameters receiving string types. Fixed [28](https://github.com/smarie/python-pytest-harvest/issues/28)

See [documentation page](https://smarie.github.io/python-pytest-harvest/changelog/) for details.

Added `__version__` attribute at package level.

See [documentation page](https://smarie.github.io/python-pytest-harvest/changelog/) for details.

It was missing from `setup.py`.

See [documentation page](https://smarie.github.io/python-pytest-harvest/changelog/) for details.

* Session-scoped and Module-scoped fixtures are now supported by `saved_fixture`. Fixes [17](https://github.com/smarie/python-pytest-harvest/issues/17).

* Documentation: new [API reference](https://smarie.github.io/python-pytest-harvest/api_reference) page.

See [documentation page](https://smarie.github.io/python-pytest-harvest/changelog/) for details.

Renamed argument in `create_results_bag_fixture` to align with the name used in `saved_fixture` (`store` instead of `storage`)

Now using `decopatch` for decorator creation. `make_saved_fixture` can thus be removed, and `saved_fixture` simplified.

Now using latest `makefun>=1.5` so that `saved_fixture` create proper fixture wrappers, using `makefun.wraps`.

See [documentation page](https://smarie.github.io/python-pytest-harvest/changelog/) for details.

Users can now use `saved_fixture` to save not only the fixture, but also some views created from it. This is interesting if each fixture is huge but users just want to save small aspects of it (name, size, etc.). Fixed [21](https://github.com/smarie/python-pytest-harvest/issues/21).

Dependency to `decorator` has been dropped and replaced with `makefun`.

See [documentation page](https://smarie.github.io/python-pytest-harvest/changelog/) for details.