Merge branch '0.1-maintenance'

[changelog skip]

Author: dahlia

.travis.yml

@@ -2,7 +2,7 @@ language: python
 python: [2.7, 3.4, 3.5, 3.6]
 install:
 - pip install tox-travis
-- mkdir "$HOME/bin"
+- mkdir -p "$HOME/bin"
 script:
 - tox -e devruntime
 - tox

tox.ini

@@ -5,6 +5,10 @@ skipsdist = true
 [testenv]
 skip_install = true
 commands =
+    ; FIXME: the following command should be removed when
+    ; https://github.com/tholo/pytest-flake8/pull/35 is merged:
+    pip install git+git://github.com/jezdez/pytest-flake8.git@flake8-3.5.0
+
     pip install -f {distdir} -e .[tests]
     pytest -v