Make ticket layout configurable

Added option for conference organizer to switch between ticket layouts (horizontal or vertical). Added test for the same.

spec/controllers/physical_ticket_controller_spec.rb

@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+describe PhysicalTicketController do
+  let(:conference) { create(:conference) }
+  let(:user) { create(:user) }
+  let(:paid_ticket_purchase) { create(:ticket_purchase, conference: conference, user: user) }
+  let(:physical_ticket) { create(:physical_ticket, ticket_purchase: paid_ticket_purchase) }
+
+  describe 'GET #show' do
+    before :each do
+      sign_in user
+      get :show, id: physical_ticket.id, conference_id: conference.short_title
+    end
+
+    it 'assigns ticket_layout' do
+      ticket_layout = conference.ticket_layout.to_sym
+      expect(assigns(:ticket_layout)).to eq ticket_layout
+    end
+  end
+end