Keras 2.0.5

• Add beta CNTK backend.
• TensorBoard improvements.
• Documentation improvements.
• Bug fixes and performance improvements.
• Improve style transfer example script.

API changes:

• Add return_state constructor argument to RNNs.
• Add skip_compile option to load_model.
• Add categorical_hinge loss function.
• Add sparse_top_k_categorical_accuracy metric.
• Add new options to TensorBoard callback.
• Add TerminateOnNaN callback.
• Generalize the Embedding layer to N (>=2) input dimensions.