Enabled Billing Plans and Agreements APIs

- Added API Classes, Samples, and Tests
- Updated Functional Tests
- Updated Documentation with new SDK Name
- Updated Few Samples to use newer nicer result page

lib/PayPal/Api/AgreementStateDescriptor.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace PayPal\Api;
+
+use PayPal\Common\PPModel;
+
+/**
+ * Class AgreementStateDescriptor
+ *
+ * Description of the current state of the agreement.
+ *
+ * @package PayPal\Api
+ *
+ * @property string note
+ * @property \PayPal\Api\Currency amount
+ */
+class AgreementStateDescriptor extends PPModel
+{
+    /**
+     * Reason for changing the state of the agreement.
+     *
+     * @param string $note
+     * 
+     * @return $this
+     */
+    public function setNote($note)
+    {
+        $this->note = $note;
+        return $this;
+    }
+
+    /**
+     * Reason for changing the state of the agreement.
+     *
+     * @return string
+     */
+    public function getNote()
+    {
+        return $this->note;
+    }
+
+    /**
+     * The amount and currency of the agreement.
+     *
+     * @param \PayPal\Api\Currency $amount
+     * 
+     * @return $this
+     */
+    public function setAmount($amount)
+    {
+        $this->amount = $amount;
+        return $this;
+    }
+
+    /**
+     * The amount and currency of the agreement.
+     *
+     * @return \PayPal\Api\Currency
+     */
+    public function getAmount()
+    {
+        return $this->amount;
+    }
+
+}