Add RFC for optimizer unification (#24)
Add RFC for optimizer unification (#24)

Thank you to everyone who commented, and on the Reddit thread. We have heard the comments and various team members are reviewing them. Please note that this PR isn't the only avenue for communication: you can discuss the general direction of TensorFlow on the discuss@tensorflow.org forum - https://groups.google.com/a/tensorflow.org/forum/#!forum/discuss
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