fix #29: add style and docs to Travis

.travis.yml

@@ -2,9 +2,6 @@ language: python
 python:
     - "2.7"
 install:
-    - pip install requirements-test.txt
-    - pip install coveralls
+    - pip install tox
 script:
-    coverage run ./manage.py test
-after_success:
-    coveralls
+    tox

tox.ini

@@ -0,0 +1,25 @@
+[tox]
+envlist = py27, style, docs
+
+[testenv]
+deps =
+    -r {toxinidir}/requirements-test.txt
+    coveralls
+commands =
+    coverage run ./manage.py test
+    coveralls
+
+[flake8]
+exclude=.?*,migrations
+
+[testenv:style]
+deps =
+    -r {toxinidir}/requirements.txt
+    flake8
+commands= flake8 .
+
+[testenv:docs]
+deps =
+    -r {toxinidir}/requirements-docs.txt
+changedir = docs
+commands = sphinx-build . html