fixes travis config

Author: saxix

.travis.yml

@@ -11,8 +11,8 @@ python:
 install:
   - "pip install -e ."
   - "pip install pytest --use-mirrors"
-  - if [[ $TRAVIS_PYTHON_VERSION == '2.6' ]]; then travis_retry pip install django<=1.5; fi
-  - if [[ $TRAVIS_PYTHON_VERSION != '2.6' ]]; then travis_retry pip install django>=1.6; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == '2.6' ]]; then travis_retry pip install 'django<1.5'; fi
+  - if [[ $TRAVIS_PYTHON_VERSION != '2.6' ]]; then travis_retry pip install 'django>=1.6'; fi
 
 
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