Recreated 1.1.0 draft spec in Markdown

Per the title, I added `/spec/owin-1.1.0draft.md` which recreates the draft spec in its entirety in GFM.

I also fixed several instances of `code` and `keywords` not being formatted correctly, if that was too presumptuous let me know and I'll change it to match the draft spec exactly.
Should this say "An `IDictionary<string, string[]>` of request headers." , like the `owin.ResponseHeaders` below?