[yaml] Added
[yaml] Fix some tests
[Yaml] Fix some tests
[Yaml] Fix re.sub py26 compat
[Yaml] Clean up
[System][Serializer] Rename serialiser to serializer
[Yaml] Add docs
[Yaml] Fix setup.py
[Yaml] Update README
Fix requirements.txt
[Yaml] Fix tests py26 BC break
Update setup.py version to 2.2.0a1
Add YamlFileLoader
Fix requirements.txt
[Yaml] Fix Simple In Place Substitution
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
Replace re.match by re.search
[Yaml] Fix brace under regex
Fix version to initial development release
[yaml] Fix requirements.txt