Merge pull request #216 from enthought/fix/travis-cython-failures

Add workaround for frequent Travis build failures during Cython compilation.

.travis.yml

@@ -9,7 +9,7 @@ install:
   - pip install -U nose
   - if ! [[ $TRAVIS_PYTHON_VERSION > '2.6' ]]; then pip install unittest2 ; fi
   - if [[ $TRAVIS_PYTHON_VERSION > '3.' ]]; then pip install numpy ; fi
-  - pip install cython
+  - pip install --install-option="--no-cython-compile" cython
   - pip install coverage
   - pip install coveralls
   - python setup.py develop