Adding Django 1.8 to build matrix

Author: philipn

.travis.yml

@@ -10,6 +10,7 @@ env:
   - DJANGO="Django>=1.5,<1.6"
   - DJANGO="Django>=1.6,<1.7"
   - DJANGO="Django>=1.7,<1.8"
+  - DJANGO="Django>=1.8,<1.9"
 install:
   - travis_retry pip install -q $DJANGO
   - pip install py-dateutil
@@ -25,5 +26,5 @@ matrix:
     - python: "3.4"
       env: DJANGO="Django>=1.4,<1.5"
     - python: "2.6"
-      env: DJANGO="Django>=1.7,<1.8"
+      env: DJANGO="Django>=1.7"
   fast_finish: true