in verify_link.json, don't actually go fetch all the rel=me links on the domain, just look for the one profile we're checking for. Saves a bunch of HTTP requests when verifying.
stub method for "verify" which only allows tokens to be used once
supports intermediate redirects, fixing #19
fixes infinite redirect loops
really fixes redirect loops and also speeds up checking by stopping earlier. fixes #19. also drops a bunch of old code that wasn't used anymore.
enable the /verify route
cleanup
be more strict about not following insecure redirects. bubbles up the redirect error to the user (#20)