Add new plugin gatsby-plugin-emotion

[rawrmonstar]

Adds support for emotion

Related to #1199 (comment)

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[KyleAMathews]

This looks great! Thanks so much!

Could you also add a very simple example site? If you run npm run plop from the root of the repo, it has a template for creating a new example site. A very simple one component site will do nicely similar to https://github.com/gatsbyjs/gatsby/tree/master/examples/using-styled-components

[KyleAMathews]

Big fan of emotion so excited to get first class support :-)

[KyleAMathews]

Awesome, thanks!

[rawrmonstar]

No problem 😁

[jlengstorf]

Hiya @rawrmonstar! 👋

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