route to conference#show for custom domain

db/migrate/20170721184810_add_custom_domain_to_conferences.rb

@@ -0,0 +1,5 @@
+class AddCustomDomainToConferences < ActiveRecord::Migration
+  def change
+    add_column :conferences, :custom_domain, :string
+  end
+end

db/schema.rb

@@ -11,10 +11,10 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170721001700) do
+ActiveRecord::Schema.define(version: 20170721184810) do
 
   create_table "ahoy_events", force: :cascade do |t|
-    t.integer  "visit_id"
+    t.uuid     "visit_id",   limit: 16
     t.integer  "user_id"
     t.string   "name"
     t.text     "properties"
@@ -127,6 +127,7 @@ ActiveRecord::Schema.define(version: 20170721001700) do
     t.integer  "end_hour",           default: 20
     t.integer  "organization_id"
     t.integer  "ticket_layout",      default: 0
+    t.string   "custom_domain"
   end
 
   add_index "conferences", ["organization_id"], name: "index_conferences_on_organization_id"