Remove public Money references ref #166

Author: barryvdh

src/Common/Message/AbstractRequest.php

@@ -308,14 +308,10 @@ protected function getCurrencies()
      * @return null|Money
      * @throws InvalidRequestException
      */
-    public function getMoney($amount = null)
+    private function getMoney($amount = null)
     {
         $amount = $amount !== null ? $amount : $this->getParameter('amount');
 
-        if ($amount instanceof Money) {
-            return $amount;
-        }
-
         if ($amount !== null) {
             $moneyParser = new DecimalMoneyParser($this->getCurrencies());
             $currencyCode = $this->getCurrency() ?: 'USD';