Update react, withProps coverage, context api migration

[tomtwttr]

This diff:

1. Updates react

yarn add react
yarn add react-dom
yarn add react-addons-test-utils

2. Adds code coverage to componentWillReceiveProps of FluxContainer. This is necessary before proper fix for UNSAFE_componentWillReceiveProps can be implemented. This relates to FluxContainer: Unsafe lifecycle methods were found within a strict-mode tree #452 .

3. Updates to migrate to new Context API

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[mariobanks]

LGTM

[waka]

This is the pull request with hope!

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[tomtwttr]

Hey @kyldvs , are you able to review?

[kyldvs]

Hey @tomtwttr, thanks for the PR! Sorry for the delay, I was holding off because it looked like a draft PR for a while :)

This looks good to me. Before I merge I will just need to make sure these changes don't cause any problems in our internal repos. This is because we like to have code on facebook org reflect what we are actually using in production, so I wouldn't want it to diverge too much. I will update you once I've pulled this in and checked.

[tomtwttr]

Thanks @kyldvs , apologies for the draft mode, was waiting for that "CLA Signed" process to go through. I look forward to hearing your results.

[kyldvs]

Looks good :) thanks!

[tomtwttr]

@kyldvs What's the process for an NPM version bump?

[waka]

Isn't the version with this pull request published on npm?

[tomtwttr]

@kyldvs Would you be able to bump npm?

[waka]

@kyldvs @mariobanks Is this library no longer pushed to npm?