Added explicit setuptools installation to handle a bug in the Python 3.4 Travis image, mentioned [here](tox-dev/tox-travis#76).

Author: afiorillo

.travis.yml

@@ -22,6 +22,7 @@ before_install:
     - "tar -xzvf nltk_data.tar.gz -C ~"
 
 install:
+  - pip install -r requirements-tests.txt
   - pip install -U .
 
 script: python run_tests.py

requirements-tests.txt

@@ -1,6 +1,7 @@
+setuptools>=39.2.0
 pep8==1.5.7
 autopep8
-flake
+flake8
 nose>=1.3.0
 pytest
 tox>=1.5.0