Switch to tensorflow backend

Author: truell20

worker/Dockerfile

@@ -41,5 +41,6 @@ RUN lein
 RUN apt-get install -y git
 
 RUN pip3 install numpy scipy scikit-learn pillow h5py
-RUN pip3 install --upgrade --no-deps git+git://github.com/Theano/Theano.git
+RUN export TF_BINARY_URL=https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.12.0rc0-cp34-cp34m-linux_x86_64.whl
+RUN pip3 install --upgrade $TF_BINARY_URL
 RUN pip3 install keras