New Koa configuration

[arthurM2x]

Includes domain creation for better breadcrumbs handling and creation of transaction per request

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Some minor whitespace issues that I found when running your branch locally.

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@arthurM2x You may need to update the jest snapshots by running yarn test -u.

Thanks for adding this example 👍 I was able to run the example locally.

[arthurM2x]

@dashed looks like I don't need to update snapshots?

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@arthurM2x you're right. Looks like the travis checks weren't happy about the whitespace issues.

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Thanks for adding these docs! 👏