Verbose pytest output to help understand test failures.

tox.ini

@@ -19,7 +19,7 @@ deps =
     pytest
 commands =
     coverage run --source=bin/ --omit=bin/autojump_argparse.py -m \
-        py.test -rxs --tb native -s --strict {posargs:tests}
+        py.test -vv -rxs --tb native -s --strict {posargs:tests}
     coverage report -m