Add tox packaging helpers (#511)

Author: ashwoods

tox.ini

@@ -34,6 +34,7 @@ deps =
     pytest3: pytest>=3.0,<4.0
 setenv =
      PYTHONPATH = {toxinidir}:{env:PYTHONPATH:}
+
 passenv = PYTEST_ADDOPTS
 usedevelop = True
 commands =
@@ -44,3 +45,39 @@ commands =
     postgres: pytest --ds=pytest_django_test.settings_postgres --strict -r fEsxXw {posargs:tests}
     sqlite: pytest --ds=pytest_django_test.settings_sqlite --strict -r fEsxXw {posargs:tests}
     sqlite_file: pytest --ds=pytest_django_test.settings_sqlite_file --strict -r fEsxXw {posargs:tests}
+
+[testenv:doc8]
+basepython = python3.6
+skip_install = true
+deps =
+    sphinx
+    doc8
+commands =
+    doc8 docs/
+
+[testenv:readme]
+basepython = python3.5
+deps =
+    readme_renderer
+commands =
+    python setup.py check -r -s
+
+# Release tooling
+[testenv:build]
+basepython = python3.6
+skip_install = true
+deps =
+    wheel
+    setuptools
+commands =
+    python setup.py -q sdist bdist_wheel
+
+[testenv:release]
+basepython = python3.5
+skip_install = true
+deps =
+    {[testenv:build]deps}
+    twine >= 1.9.1
+commands =
+    {[testenv:build]commands}
+    twine upload -s --skip-existing dist/*