Drop Python 2.6 and Django 1.4 support

Author: tobami

.travis.yml

@@ -1,18 +1,10 @@
 language: python
 python:
-  - 2.6
   - 2.7
   - 3.4
 env:
   - DJANGO_VERSION=1.8.5
   - DJANGO_VERSION=1.6.11
-  - DJANGO_VERSION=1.4.22
-matrix:
-  exclude:
-    - python: 2.6
-      env: DJANGO_VERSION=1.8.5
-    - python: 3.4
-      env: DJANGO_VERSION=1.4.22
 install:
   - pip install -q Django==$DJANGO_VERSION
   - python setup.py install