Update travis

.travis.yml

@@ -29,8 +29,9 @@ addons:
 install:
   - >
       conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION
-      numpy scipy nose pandas matplotlib mkl-service tensorflow theano
+      numpy scipy nose pandas matplotlib mkl-service theano
   - source activate test-environment
+  - pip install https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-1.8.0-cp34-cp34m-linux_x86_64.whl
   - pip install pypandoc pylint
   - pip install -r requirements.txt
   - pip install .