changed skip dotted labels to use last part

I had a problem with the original implementation, because it did not find my tests.
Directorty structure:
proj_home/
--manage.py
--apps/
----app1/
--------features/
--------features/environment.py 
--------features/userfeeds.feature
--------features/steps/
--------features/steps/app1.py
--------tests/
[ + some additional stuff]

INSTALLED_APPS = [...,
    'apps.app1']

now it does and i dont see any complications.