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

lib/PayPal/Api/OpenIdError.php

@@ -0,0 +1,76 @@
+<?php
+namespace PayPal\Api;
+
+use PayPal\Common\PayPalModel;
+
+/**
+ * Error resource
+ */
+class OpenIdError extends PayPalModel
+{
+
+    /**
+     * A single ASCII error code from the following enum.
+     *
+     * @param string $error
+     */
+    public function setError($error)
+    {
+        $this->error = $error;
+        return $this;
+    }
+
+    /**
+     * A single ASCII error code from the following enum.
+     *
+     * @return string
+     */
+    public function getError()
+    {
+        return $this->error;
+    }
+
+    /**
+     * A resource ID that indicates the starting resource in the returned results.
+     *
+     * @param string $error_description
+     */
+    public function setErrorDescription($error_description)
+    {
+        $this->error_description = $error_description;
+        return $this;
+    }
+
+    /**
+     * A resource ID that indicates the starting resource in the returned results.
+     *
+     * @return string
+     */
+    public function getErrorDescription()
+    {
+        return $this->error_description;
+    }
+
+    /**
+     * A URI identifying a human-readable web page with information about the error, used to provide the client developer with additional information about the error.
+     *
+     * @param string $error_uri
+     */
+    public function setErrorUri($error_uri)
+    {
+        $this->error_uri = $error_uri;
+        return $this;
+    }
+
+    /**
+     * A URI identifying a human-readable web page with information about the error, used to provide the client developer with additional information about the error.
+     *
+     * @return string
+     */
+    public function getErrorUri()
+    {
+        return $this->error_uri;
+    }
+
+
+}