Fix non-PEP8 accounts/authentication.py.
Also imports are as recommended by Two Scoops of Django.
Removed explicit object subclass in PersonaAuthenticationBackend.
PEP8 fixes in accounts/models.py
PEP8 fixes in accounts/tests/test_authentication.
PEP8 fixes in accounts/views.py
PEP8 fixes in test_models.py
PEP8 fixes in test_views.py
PEP8 fixes in fabfile.py
Replaced the percent string formatting operator,
with the recommended .format().
Fixed imports in create_session.py
Organized imports in base.py
PEP8 fixes in base.py
PEP8 fixes in functional_tests/fabfile.py
PEP8 fixes in home_and_list_pages.py
Fixed explicity subclass object for HomePage and ListPage
PEP8 fixes in server_tools.py
PEP8 fixes in test_list_item_validation.py
PEP8 fixes in test_login.py
PEP8 fixes in test_sharing.py
PEP8 fixes in test_simple_list_creation.py