Added Subscription model to send emails

db/migrate/20140724153520_create_subscriptions.rb

@@ -0,0 +1,9 @@
+class CreateSubscriptions < ActiveRecord::Migration
+  def change
+    create_table :subscriptions do |t|
+      t.belongs_to :user
+      t.belongs_to :conference
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -408,6 +408,13 @@ ActiveRecord::Schema.define(version: 20140801170430) do
     t.datetime "updated_at"
   end
 
+  create_table "subscriptions", force: true do |t|
+    t.integer  "user_id"
+    t.integer  "conference_id"
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
   create_table "supporter_levels", force: true do |t|
     t.integer "conference_id"
     t.string  "title",         null: false