Added registration-ticket

Added registration type tickets that will used in the check-in process

app/views/admin/tickets/_form.html.haml

@@ -13,5 +13,6 @@
       = f.input :description, input_html: { rows: 5, data: { provide: "markdown-editable" } }
       = f.input :price
       = f.input :price_currency, as: :select, class: 'form-control', collection: ['USD', 'EUR', 'GBP', 'INR', 'CNY'], include_blank: false
+      = f.input :registration_ticket, hint: 'A registration ticket is with which user register for the conference.'
       %p.text-right
         = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }