basic working lua proxying to apiserver

Made modifications to nginx config to support basic proxying to
API Server. The AUTH Server is currently not directly used. Also
added some more installtion docs for darwin.
cleaned up and expanded documentation
move LUA out to a script
expand functionality of authservice
updated README with use case overviews
pull in resty_memcache library
fully functional proof of concept minus sessionids

- requests redirect to auth server
- auth server does auth, sets auth_header, redirects to api server
- nginx reads session id from request, looks up auth_token, sets auth header
- api server allows allows

This code needs so much cleanup, though. It's one giant hack.