note how to inpsect the files being deployed
use a real URL struct
immediately return after http.Error()
extract function httpCallback(); return a real URL struct
move to a javascript-based feed query

This version splits the process into stages:

* /feed -> redirects to untappd for OAUTH
* /oauth/untappd -> writes access_token to cookie, redirects to
  /displayFeed
* /displayFeed -> executes and returns feed.html template
* javascript -> reads access_token and requests feed data