Fixed entry_points scripts for setup.py

``setup.py`` uses the ``entry_points`` argument to the ``setup`` function, but it's syntax was incorrect: to generate a standalone script, one has to use ``console_scripts`` instead of ``console``.

Using this, after install you can execute ``maestro -f file.yaml`` instead of ``python -m maestro -f file.yaml``, although the latter still works.

All tests passed with ``tox``.