Host the docs on readthedocs

[superbobry]

This would make the documentation change diffs more readable (as opposed to e.g. #221). If you're OK, I can submit a PR doing this.

[leewyang]

Yeah, that sounds like it's worth a shot...

[superbobry]

@leewyang do you have an RTD account? I'd like to add you as a maintainer for TensorFlowOnSpark.

After that, you'd need to integrate the GitHub repo with RTD (requires admin rights in the repo).

[leewyang]

Just created an account "leewyang"

[leewyang]

@superbobry can you submit a PR for your changes?

[leewyang]

Docs now auto-generated to gh-pages branch.