Update customer sample for API changes.

Mobile Buy SDK Sample Apps/Customers App - Swift/Sample App Customers/LoginViewController.swift

@@ -65,7 +65,7 @@ class LoginViewController: UITableViewController {
             if let customer = customer,
                 let token = token {
                 self.clear()
-                self.delegate?.authenticationDidSucceedForCustomer(customer, withToken: token)
+                self.delegate?.authenticationDidSucceedForCustomer(customer, withToken: token.accessToken)
             } else {
                 self.delegate?.authenticationDidFailWithError(error)
             }

Mobile Buy SDK Sample Apps/Customers App - Swift/Sample App Customers/OrdersViewController.swift

@@ -52,7 +52,7 @@ class OrdersViewController: UIViewController {
     }
     
     private func loadOrders() {
-        BUYClient.sharedClient.getOrdersForCustomerWithID(String(self.customer.identifier)) { (orders, error) in
+        BUYClient.sharedClient.getOrdersForCustomerCallback { (orders, error) in
             if let orders = orders {
                 self.orders = orders
                 self.tableView.reloadData()

Mobile Buy SDK Sample Apps/Customers App - Swift/Sample App Customers/SignupViewController.swift

@@ -73,7 +73,7 @@ class SignupViewController: UITableViewController {
             if let customer = customer,
                 let token = token {
                 self.clear()
-                self.delegate?.authenticationDidSucceedForCustomer(customer, withToken: token)
+                self.delegate?.authenticationDidSucceedForCustomer(customer, withToken: token.accessToken)
             } else {
                 self.delegate?.authenticationDidFailWithError(error)
             }