Adding Auth doc

This document updates the aerogear.org docs to show off the new fluent Configuration APIs and removes references to removed classes.
I think would be great to include more URL references, for example: "AuthenticationModule is a child of PipeModule and is appended to a Pipe during configuration with PipeConfiguration.module. You can find more information about PipeModule in the pipe tutorial."

An URL for PipeModule, Pipe, PipeConfiguration.module and maily pipe tutorial would be perfect. 101% of people outside of AeroGear are not familiar with it and references will guide them.