Improved travis tests. Added Django==1.11 tests

Author: syrusakbary

.travis.yml

@@ -25,6 +25,7 @@ install:
     pip install -e .[test]
     pip install psycopg2 # Required for Django postgres fields testing
     pip install django==$DJANGO_VERSION
+    pip install django-filter==$DJANGO_FILTER_VERSION
     python setup.py develop
   elif [ "$TEST_TYPE" = lint ]; then
     pip install flake8
@@ -45,18 +46,20 @@ after_success:
   fi
 env:
   matrix:
-  - TEST_TYPE=build DJANGO_VERSION=1.10
+  - TEST_TYPE=build DJANGO_VERSION=1.11 DJANGO_FILTER_VERSION=1.0.2
 matrix:
   fast_finish: true
   include:
   - python: '2.7'
-    env: TEST_TYPE=build DJANGO_VERSION=1.6
+    env: TEST_TYPE=build DJANGO_VERSION=1.6 DJANGO_FILTER_VERSION=1.0.0
   - python: '2.7'
-    env: TEST_TYPE=build DJANGO_VERSION=1.7
+    env: TEST_TYPE=build DJANGO_VERSION=1.7 DJANGO_FILTER_VERSION=1.0.0
   - python: '2.7'
-    env: TEST_TYPE=build DJANGO_VERSION=1.8
+    env: TEST_TYPE=build DJANGO_VERSION=1.8 DJANGO_FILTER_VERSION=1.0.2
   - python: '2.7'
-    env: TEST_TYPE=build DJANGO_VERSION=1.9
+    env: TEST_TYPE=build DJANGO_VERSION=1.9 DJANGO_FILTER_VERSION=1.0.2
+  - python: '2.7'
+    env: TEST_TYPE=build DJANGO_VERSION=1.10 DJANGO_FILTER_VERSION=1.0.2
   - python: '2.7'
     env: TEST_TYPE=lint
 deploy: