Renaming Namespaces and Organizing Classes

- Updated OpenId classes to be in API namespace
- Updated PP Naming Convention to PayPal Naming Convention
- FormatConverter Class got its own namespace
- Handlers are grouped in Handler namespace
- Samples and Tests Updated Accordingly

tests/PayPal/Test/Api/OpenIdErrorTest.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace PayPal\Test\Api;
+
+use PayPal\Api\OpenIdError;
+
+/**
+ * Test class for OpenIdError.
+ *
+ */
+class OpenIdErrorTest extends \PHPUnit_Framework_TestCase
+{
+
+    /** @var  OpenIdError */
+    private $error;
+
+    /**
+     * Sets up the fixture, for example, opens a network connection.
+     * This method is called before a test is executed.
+     */
+    protected function setUp()
+    {
+        $this->error = new OpenIdError();
+        $this->error->setErrorDescription('error description')
+            ->setErrorUri('http://developer.paypal.com/api/error')
+            ->setError('VALIDATION_ERROR');
+    }
+
+    /**
+     * Tears down the fixture, for example, closes a network connection.
+     * This method is called after a test is executed.
+     */
+    protected function tearDown()
+    {
+    }
+
+    /**
+     * @test
+     */
+    public function testSerializationDeserialization()
+    {
+        $errorCopy = new OpenIdError();
+        $errorCopy->fromJson($this->error->toJson());
+
+        $this->assertEquals($this->error, $errorCopy);
+    }
+}