Add owin.RequestUser

[khellang]

The key owin.RequestUser was voted on and accepted as part of owin/owin#9, and has been added to the spec under Section 3.2.1 Request Data.

This PR adds the key to the environment and feature collection ✨

The property will set both server.User and owin.RequestUser, as well as fall back from owin.RequestUser to server.User on retrieval, for interoperability reasons.

[dnfclas]

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[Tratcher]

[davidfowl]

Travis is failing

[davidfowl]

@khellang can you rebase this on top of dev, we fixed the ci.

[khellang]

Hmm. Rebased, but still failing. Seems unrelated tho 😕

[davidfowl]

Yea that one is a known issue.

[damianh]

👍 good stuff

[davidfowl]

@khellang Thanks for the PR!

[khellang]

NP 👍 I have another one cooking for the "official" BuildFunc at dev...khellang:build-func (though it hasn't been finalized yet).

There needs to be a way for OWIN middleware to access the startup properties, and the current AddMiddleware delegate doesn't cut it.