Documentation: An alternative login workflow

[jonsa]

As requested in #19 here is my current login workflow.

I've laid out all the related code in this gist

I'm not sure how to present an alternative workflow in the documentation therefor I'm starting this discussion to figure out the how's and where's. If you want take the code and incorporate it into the documentation yourselves then that's fine too, I'm not much of a documentation guy 😄

[weierophinney]

This repository has been closed and moved to mezzio/mezzio-authentication-session; a new issue has been opened at mezzio/mezzio-authentication-session#2.