Remove remnants from previous PRs

- warnings in configparser were silenced upstream (unless `-3` is passed)
- we no longer invoke tests from `python setup.py test`

pytest.ini

@@ -3,7 +3,5 @@ norecursedirs = .git .* *.egg* old docs dist build
 addopts = -rw
 filterwarnings =
     error
-    # python2.x `configparser` warns about native string but it works fine
-    ignore:You passed a bytestring as `filenames`.*:DeprecationWarning
     # python3.4 raises this when importing setuptools
     ignore:The value of convert_charrefs will become True in 3.5.*:DeprecationWarning

setup.cfg

@@ -1,6 +1,3 @@
-[aliases]
-test=pytest
-
 [bdist_wheel]
 universal = 1