README.md - removed refs to old model, removed apple pay sample

Removed references to the old model SDK.
Also removed Apple Pay sample, as advised by @ramittal ('reference the sample-code so that it is always up-do date and verified functional'). But, I thought one sample ('Quick Usage Example' here) should be kept to illustrate the setup.

Author: Vyoam

README.md

@@ -58,7 +58,6 @@ $request->setMerchantAuthentication($merchantAuthentication);
 ...
 
 ## Usage Examples
-*Users of previous SDK model please note: The SDK is moving towards using a new model. This model allows us to maintain SDKs better by being more responsive to API changes. (To determine if a code is using the old model or new, a prominent difference is the usage of controllers, which is used only with the new model.) Refer the [old README](README_OLD.md) for samples of the old model.*
 
 Apart from this README, you can find details and examples of using the SDK in the following places:
 - [Developer Center Reference](http://developer.authorize.net/api/reference/index.html)
@@ -123,56 +122,6 @@ else
 }
 ```
 
-### Apple Pay Example
-
-````php
-  <?php
-  require 'vendor/autoload.php';
-
-  use net\authorize\api\contract\v1 as AnetAPI;
-  use net\authorize\api\controller as AnetController;
-
-  define("AUTHORIZENET_LOG_FILE", "phplog");
-   
-  $merchantAuthentication = new AnetAPI\MerchantAuthenticationType();
-  $merchantAuthentication->setName("5KP3u95bQpv");
-  $merchantAuthentication->setTransactionKey("4Ktq966gC55GAX7S");
-  $refId = 'ref' . time();
-
-  $op = new AnetAPI\OpaqueDataType();
-  $op->setDataDescriptor("COMMON.APPLE.INAPP.PAYMENT");
-  $op->setDataValue("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");
-  $paymentOne = new AnetAPI\PaymentType();
-  $paymentOne->setOpaqueData($op);
-
-  //create a transaction
-  $transactionRequestType = new AnetAPI\TransactionRequestType();
-  $transactionRequestType->setTransactionType( "authCaptureTransaction"); 
-  $transactionRequestType->setAmount(151);
-  $transactionRequestType->setPayment($paymentOne);
-
-  $request = new AnetAPI\CreateTransactionRequest();
-  $request->setMerchantAuthentication($merchantAuthentication);
-  $request->setRefId( $refId);
-  $request->setTransactionRequest( $transactionRequestType);
-
-  $controller = new AnetController\CreateTransactionController($request);
-  $response = $controller->executeWithApiResponse( \net\authorize\api\constants\ANetEnvironment::SANDBOX);
- 
-  if ($response != null)
-  {
-    $tresponse = $response->getTransactionResponse();
-
-    if (($tresponse != null) && ($tresponse->getResponseCode()=="1") )   
-    {
-      echo " AUTH CODE : " . $tresponse->getAuthCode() . "\n";
-      echo " TRANS ID  : " . $tresponse->getTransId() . "\n";
-    }
-  }
-  
-?>
-````
-
 ## Testing
 
 Integration tests for the AuthorizeNet SDK are in the `tests` directory. These tests