Handle tf12 depreciations

[jrock08]

https://www.tensorflow.org/versions/r0.12/api_docs/python/state_ops.html#deprecated-functions-removed-after-2017-03-02-please-don-t-use-them

https://www.tensorflow.org/versions/r0.12/api_docs/python/state_ops.html#all_variables

https://www.tensorflow.org/versions/r0.12/api_docs/python/state_ops.html#initialize_all_variables

https://www.tensorflow.org/versions/r0.12/api_docs/python/state_ops.html#initialize_local_variables

https://www.tensorflow.org/versions/r0.12/api_docs/python/state_ops.html#initialize_variables