Use tox in TravisCI (DRY!)

.travis.yml

@@ -1,48 +1,42 @@
 language: python
-python:
-- '2.7'
-- '3.4'
-- '3.5'
-- '3.6'
+python: '3.5'
 
 env:
   matrix:
-  - DJANGO='>=1.7,<1.8'
-  - DJANGO='>=1.8,<1.9'
-  - DJANGO='>=1.9,<1.10'
-  - DJANGO='>=1.10,<1.11'
-  - DJANGO='>=1.11,<2.0'
-  - DJANGO='>=2.0,<2.1'
+# sort by django version, next to by python version
+# Django 1.7 support Python 2.7, 3.4
+  - TOX_ENV=django17-py27
+  - TOX_ENV=django17-py34
+# Django 1.8 support Python 2.7, 3.4, 3.5
+  - TOX_ENV=django18-py27
+  - TOX_ENV=django18-py34
+  - TOX_ENV=django18-py35
+# Django 1.9 support Python 2.7, 3.4, 3.5
+  - TOX_ENV=django19-py27
+  - TOX_ENV=django19-py34
+  - TOX_ENV=django19-py35
+# Django 1.10 support Python 2.7, 3.4, 3.5
+  - TOX_ENV=django110-py27
+  - TOX_ENV=django110-py34
+  - TOX_ENV=django110-py35
+# Django 1.11 support all supported Python interpreter
+# Django 2.0 support Python 3.4, 3.5, 3.6
+  - TOX_ENV=django111-py34
+  - TOX_ENV=django111-py35
+  - TOX_ENV=django111-py36
+
   global:
   - secure: aswHU7pQroGM+GHoYlhXzzk2FYfqxXJORjqXPsbgoHAIu4Bssaj8+YAzIcdy3j9kSt4I8VBpjnn8H/wzQXki75JBZOosQrIeMK018+uR+ZMONBLqDYW/N7EJHLgZt9QXxQNKeZygrD4GN/Dc4gLHGvPQC/RfPuuHcnF0Liaahoo=
   - secure: RZ6M6984P885GRoyx9n/WCCWGoFAzYpS8sZkXu3e/HK9oPXfaM2IEHjkq03jIC/FcWn/QMtFjOUBqQU94rnqdivFdFkeZHk1WUQgC0hztH3Qhh9zu2PNIrYUDpVD5dJqBpprWbSwFP8yNsJlP9A2RUubTlZblKHuaBhhiuNN+kU=
   - secure: gsAAl/RaTodLJDHWOuHZWtooa9/psyXBONF7ElZOTki3WvH+KugtjuXn3pXBGbUhvGqd5qfgPqX7WQOFP9KTdkXBbkU20rCHLh3SV8V2vRkGFAFiGPBTFfSA83zFNMvmgEnTww4OzYsfs4wHTEyxBeQkggnB5bXEvqkFVrHBjuQ=
   - secure: mMa7UUt+CQDB52fGM1T3oRL67OzQzRIc+BQCOqUEUhBV7p5g7Y1Hv6NTdVZTvK16x3DsP+5kFNd1v7rsTFw2qzP3hOxIv2BtMPuSzZdnN85Zd/nGwnztxzj/rqw7TMBaYvIdEZZbpRF/K0p0Xr6LJK2s9UkPXPUaLqly7kNi360=
-matrix:
-  exclude:
-# sort by django version, next to by python version
-# Django 1.7 support Python 2.7, 3.4
-  - env: DJANGO='>=1.7,<1.8'
-    python: '3.5'
-  - env: DJANGO='>=1.7,<1.8'
-    python: '3.6'
-# Django 1.8 support Python 2.7, 3.4, 3.5
-  - env: DJANGO='>=1.8,<1.9'
-    python: '3.6'
-# Django 1.9 support Python 2.7, 3.4, 3.5
-  - env: DJANGO='>=1.9,<1.10'
-    python: '3.6'
-# Django 1.10 support Python 2.7, 3.4, 3.5
-  - env: DJANGO='>=1.10,<1.11'
-    python: '3.6'
-# Django 1.11 support all supported Python interpreter
-# Django 2.0 support Python 3.4, 3.5, 3.6
-  - env: DJANGO='>=2.0,<2.1'
-    python: '2.7'
+
 install:
-  - pip install -q Django$DJANGO
-  - pip install -r test_requirements.txt
-  - pip install -q -e .
+  - pip install tox
+
 script:
-  - python manage.py test
+  # Update Python 3.6 path - see bug https://github.com/travis-ci/travis-ci/issues/4990
+  - if [[ $TOX_ENV = *"py36"* ]]; then echo "Activated PY3.6"; source ~/virtualenv/python3.6/bin/activate; pip install tox; fi
+  - tox -e $TOX_ENV
+
 sudo: false