remove coverage.py from nosetests
remove coverage.py from nosetests

Currently does not work due a weird exception:

    coverage.misc.NoSource: No source for code:
    '/var/lib/jenkins/workspace/acrylamid/PYTHON/System/TOXENV/py27/label/master/__init__.py'

markvl/acrylamid,markvl/acrylamid,markvl/acrylamid