Add LICENCE file.

git-svn-id: http://svn.zoo-project.org/svn/trunk@419 4b6b6ad6-68b3-4dcc-9231-bd9b83bc5dc3
Update header of some Python files.

git-svn-id: http://svn.zoo-project.org/svn/trunk@420 4b6b6ad6-68b3-4dcc-9231-bd9b83bc5dc3
Move test_service.py in its correct place.

git-svn-id: http://svn.zoo-project.org/svn/trunk@421 4b6b6ad6-68b3-4dcc-9231-bd9b83bc5dc3