More naming fixes in travis config

Author: EnTeQuAk

.travis.yml

@@ -13,7 +13,7 @@ env:
 install:
   - pip install tox
 script:
-  - tox -e "$TRAVIS_PYTHON_VERSION-$DJANGO_VERSION"
+  - tox -e "py$TRAVIS_PYTHON_VERSION-$DJANGO_VERSION"
 matrix:
   exclude:
    - python: "2.6"