lib/models: revise for TensorFlow 1.0.x
lib/models: revise for TensorFlow 1.0.x

Specifically, update the models to deal with depreciated functions and
API breaking changes related to:
- tf.summary
- tf.concat()
- tf.nn.sparse_softmax_cross_entropy_with_logits()
- tf.global_variables_initializer()

mdeff/cnn_graph