Add webcam_url to serializer, update tests

app/serializers/device_serializer.rb

@@ -1,3 +1,3 @@
 class DeviceSerializer < ActiveModel::Serializer
-  attributes :id, :name, :uuid
+  attributes :id, :name, :uuid, :webcam_url
 end

spec/controllers/api/tokens/users_controller_create_spec.rb

@@ -10,7 +10,8 @@ describe Api::TokensController do
       payload = {user: {email: user.email, password: "password"}}
       post :create, payload
       token = json[:token][:unencoded]
-      expect(token[:iss]).to eq("http://test.host/")
+      expect(token[:iss].last).not_to eq("/") # Trailing slashes are BAD!
+      expect(token[:iss]).to eq("http://localhost:3000")
     end
   end
 end