Cleaning imports statements
[EventDispatcher] Add meta files
Fix requirements.txt
Update setup.py version to 2.2.0a1
[EventDispatcher] Add missing tests
Fix requirements.txt
Fix function parameters

When an optionnal parameter is not a scalar type it value is create only once.
@see src/pymfony/component/system/test/test_func_params.py
Update pymfony urls
Fix version to initial development release
Happy Yew Year