Add Brunch to Alternatives

[beznosd]

Added Brunch to the alternatives section.

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[gaearon]

Happy to do it if you also add Brunch instructions to https://facebook.github.io/react/docs/installation.html#development-and-production-versions and https://facebook.github.io/react/docs/optimizing-performance.html#use-the-production-build.

[beznosd]

@gaearon done, please check
react/react#9074

[Timer]

Could you please fix up this PR and order the options alphabetically?

Thanks!

[gaearon]

We ended up nixing the section in favor of a more descriptive catalog.