Merge remote-tracking branch 'remotes/origin/master' into tf0.12

- pip install keras

- export KERAS_BACKEND=tensorflow

- conda install -c omnia mdtraj

- pip install tensorflow

- python setup.py install

#- if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then export TF_BINARY_URL=https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.12.0rc1-cp27-none-linux_x86_64.whl;

#  -O else export TF_BINARY_URL=https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.12.0rc1-cp35-cp35m-linux_x86_64.whl;

#  -O fi 

#- if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then pip install --ignore-installed --upgrade $TF_BINARY_URL;

#  -O else pip3 install --ignore-installed --upgrade $TF_BINARY_URL;

#  -O fi

- conda install -c https://conda.anaconda.org/jjhelmus tensorflow=0.10.0rc0

script:

- nosetests -v deepchem --nologcapture

after_success:

      train_op = self.get_training_op(

          self.train_graph.graph, self.train_graph.loss)

      with self._get_shared_session(train=True) as sess:

        sess.run(tf.initialize_all_variables())

        sess.run(tf.global_variables_initializer())

        saver = tf.train.Saver(max_to_keep=max_checkpoints_to_keep)

        # Save an initial checkpoint.

        saver.save(sess, self._save_path, global_step=0)