updates travis config

Author: saxix

.travis.yml

@@ -9,7 +9,7 @@ python:
   - "pypy"
 
 install:
-  - pip install -e
+  - pip install .
   - 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