Remove guid and public_key from WebFinger

Related to diaspora/diaspora_federation#39

config/initializers/diaspora_federation.rb

@@ -20,9 +20,7 @@ DiasporaFederation.configure do |config|
           profile_url:   person.profile_url,
           atom_url:      person.atom_url,
           salmon_url:    person.receive_url,
-          subscribe_url: AppConfig.url_to("/people?q={uri}"),
-          guid:          person.guid,
-          public_key:    person.serialized_public_key
+          subscribe_url: AppConfig.url_to("/people?q={uri}")
         )
       end
     end

spec/federation_callbacks_spec.rb

@@ -13,8 +13,6 @@ describe "diaspora federation callbacks" do
       expect(wf.atom_url).to eq(person.atom_url)
       expect(wf.salmon_url).to eq(person.receive_url)
       expect(wf.subscribe_url).to eq(AppConfig.url_to("/people?q={uri}"))
-      expect(wf.guid).to eq(person.guid)
-      expect(wf.public_key).to eq(person.serialized_public_key)
     end
 
     it "returns nil if the person was not found" do