Tursu

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* Refactor collect of tests if the module is not loaded.

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* Fix collect of tests if the module is not loaded.

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* Add a pattern matcher based on regular expression.
* fix the cli command while choosing a .feature file directly from the cli.
* Update the doc, add a migrate pytest-bdd.

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* Update description for pypi.
* Update Dockerfile.

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* Breaking change: now tursu is declared as a pytest plugin using entrypoint.
* the __init__.py will not scan the module, pytest will.
remove the code here.
* the conftest.py of the tested file has to be updated.
The tursu fixture is registered by the plugin, and now, to register tests,
the new command is:
python
from tursu.entrypoints.plugin import tursu_collect_file

tursu_collect_file()

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* Improve test display on the term.