Update requirements path.

.travis.yml

@@ -5,7 +5,7 @@ python:
     - "2.7"
     - "3.2"
 install:
-    - pip install --use-mirrors -r utils/travis/requirements-${TRAVIS_PYTHON_VERSION}.txt
+    - pip install --use-mirrors -r tests/travis/requirements-${TRAVIS_PYTHON_VERSION}.txt
     - python setup.py install
 script:
     - python setup.py test