Drop Django 1.6 and 1.7 from the tox and Travis test matrix.

.travis.yml

@@ -6,12 +6,6 @@ env:
     - TOX_ENV=py27-flake8
     - TOX_ENV=py27-docs
 
-    - TOX_ENV=py27-django1.7-drf2.4
-    - TOX_ENV=py27-django1.7-drf3.0
-    - TOX_ENV=py27-django1.7-drf3.1
-    - TOX_ENV=py27-django1.7-drf3.2
-    - TOX_ENV=py27-django1.7-drf3.3
-
     - TOX_ENV=py27-django1.8-drf3.0
     - TOX_ENV=py27-django1.8-drf3.1
     - TOX_ENV=py27-django1.8-drf3.2
@@ -21,23 +15,11 @@ env:
     - TOX_ENV=py27-django1.9-drf3.2
     - TOX_ENV=py27-django1.9-drf3.3
 
-    - TOX_ENV=py33-django1.7-drf2.4
-    - TOX_ENV=py33-django1.7-drf3.0
-    - TOX_ENV=py33-django1.7-drf3.1
-    - TOX_ENV=py33-django1.7-drf3.2
-    - TOX_ENV=py33-django1.7-drf3.3
-
     - TOX_ENV=py33-django1.8-drf3.0
     - TOX_ENV=py33-django1.8-drf3.1
     - TOX_ENV=py33-django1.8-drf3.2
     - TOX_ENV=py33-django1.8-drf3.3
 
-    - TOX_ENV=py34-django1.7-drf2.4
-    - TOX_ENV=py34-django1.7-drf3.0
-    - TOX_ENV=py34-django1.7-drf3.1
-    - TOX_ENV=py34-django1.7-drf3.2
-    - TOX_ENV=py34-django1.7-drf3.3
-
     - TOX_ENV=py34-django1.8-drf3.0
     - TOX_ENV=py34-django1.8-drf3.1
     - TOX_ENV=py34-django1.8-drf3.2
@@ -51,7 +33,7 @@ matrix:
   fast_finish: true
 
 install:
-  - pip install tox
+    - pip install tox
 
 script:
     - tox -e $TOX_ENV

tox.ini

@@ -1,16 +1,13 @@
 [tox]
 envlist =
        py27-{flake8,docs},
-       {py27,py33,py34}-django{1.6,1.7}-drf{2.4,3.0,3.1,3.2,3.3},
        {py27,py33,py34}-django{1.8,1.9}-drf{3.0,3.1,3.2,3.3}
 
 [testenv]
 commands = ./runtests.py --fast {posargs}
 setenv =
        PYTHONDONTWRITEBYTECODE=1
 deps =
-       django1.6: Django==1.6.11  # Should track minimum supported
-       django1.7: Django==1.7.11  # Should track maximum supported
        django1.8: Django==1.8.7  # Should track maximum supported
        django1.9: Django==1.9.0  # Should track maximum supported
        drf2.4: djangorestframework==2.4.5  # Should track minimum supported