Fixes warnings in the .py files

@menshikh-iv Fixing warnings in the .py files according to the Google Code Style. Most of the warnings were due to indentation errors.

build succeeded, 21 warnings.
Getting there. :-)

Now I'm down to,
`build succeeded, 5 warnings.`

However, I'm in a bit of a fix. Changing `doc2vec.rst` and `word2vec.rst` to `.inc` files removed the duplicate warnings but it also invalidates the references to these documents from my main toctree and the following warnings are produced.

`apiref.rst:8: WARNING: toctree contains reference to nonexisting document u'models/doc2vec'`
`apiref.rst:8: WARNING: toctree contains reference to nonexisting document u'models/word2vec'`

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