add support for tensorflow 1.12-1.15 and python 3.6-3.7

[fcakyon]

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[woshiZS]

_ No description provided. _

Sorry to bother you, I used your fork to train this model on a no gpu machine，When I run train_segan.sh，I met the following error:
tensorflow.python.framework.errors_impl.NotFoundError: No registered 'TemporaryVariable' OpKernel for XLA_CPU devices compatible with node {{node device_1/gradients/AddN_14/tmp_var}}
Could you please help me figure out what problem happens? Any reply will be appreciated.

[ChangThinkTech]

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