use host from http headers for audience
Working to make config clearer
Use long names for config options
Merge pull request #13 from WardCunningham/nrn/cfg

Cleaning up configuration.
Merge branch 'master' into persona-issue6
audience from header, or argv.url if provided
User-focused ReadMe
Concept and value of fededrated wiki
Omit references to missing documentation.
Persona centric welcome-visitors
manual merge
Merge pull request #11 from paul90/persona-issue6

In persona.verify_assertion use http host as the audience, rather than argv.u
tweaking ReadMe wording