A step towards development standardization.

[eli-osherovich]

Configured autoformatter (yapf) to follow the Google python style. Added some entries to .gitignore for VSCode.

Summary

Related Issues

PR Overview

• [n] This PR requires new unit tests [y/n] (make sure tests are included)
• [n] This PR requires to update the documentation [y/n] (make sure the docs are up-to-date)
• [y] This PR is backwards compatible [y/n]
• [n] This PR changes the current API [y/n] (all API changes need to be approved by fchollet)

An attempt to standardize development (code style) to minimize spurious diffs.

[eli-osherovich]

@Dref360 Do you have any objections here?

I would like to setup autoformatting (by yapf) to:

1. keep single code style (google)
2. get rid of spurious diffs due to different formatting in PRs.

[Dref360]

Sorry for the delay, I had to verify some things.

In the near future, keras-prepro will be merged back to keras as we do not support multiple backends anymore.

So it doesn't make much sense to push this PR right now since we will have to make it again once we move.

I'll close for now, feel free to open a similar PR on https://github.com/keras-team/keras