added groups to create_user factory method
PEP8-ified  file findeco/tests/test_marking.py
PEP8-ified  file findeco/tests/test_view_helpers.py
PEP8-ified  file findeco/view_helpers.py
PEP8-ified  file node_storage/tests/test_node.py
derivation argument is no longer copied to derivate. Fixes #21