Tensorboard-pytorch

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* remove tensorflow dependency for embedding function
* fixed incorrect image<->label pairing in embedding function (12)
* unifies API call and adds docstring. Documentation is available at: http://tensorboard-pytorch.readthedocs.io/

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* add travis test (py2.7, py3.6)
* add support for python2 (in PyPI)

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* supports embedding

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* supports graph summary
* fixed np.histogram issue

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* supports text summary

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* supports audio summary