Remove temporary workaround

tox.ini

@@ -15,8 +15,7 @@ deps=
 sitepackages = False
 recreate = False
 commands = pip install -U -r{toxinidir}/requirements/dev.txt
-           pip install -U {toxinidir}/../case
-           py.test -xv
+           py.test -xv --cov=celery --cov-report=html
 
 basepython =
     2.7,flake8,flakeplus,apicheck,linkcheck,configcheck: python2.7