Fixes #11 - incorrect OAuth docs

Author: baileyherbert

README.md

@@ -92,7 +92,7 @@ $oauth = new Herbert\Envato\Auth\OAuth([
 ]);
 
 // Get the token (returns null if unavailable)
-$token = $oauth->token;
+$token = $oauth->auth;
 
 // Redirect the user if they're not authorized yet
 if (!$token) {
@@ -128,7 +128,7 @@ if (isset($_SESSION['oauth_session'])) {
 
 // No saved session, so let's start a new one
 else {
-    if ($oauth->token) {
+    if ($oauth->auth) {
         // Save the OAuth session
         $_SESSION['oauth_session'] = $oauth->session;
     }
@@ -140,7 +140,7 @@ else {
 }
 
 // Create the client
-$client = new Herbert\EnvatoClient($oauth->token);
+$client = new Herbert\EnvatoClient($oauth->auth);
 ```
 
 - The `$oauth->session` member will contain a JSON string with data for the current authorization.

src/Envato/Auth/OAuth.php

@@ -176,8 +176,12 @@ public function __get($property) {
             if ($property == 'auth') {
                 // Only if we've just returned from authorization
                 if (isset($_GET['code'])) {
-                    return ($this->generatedToken) ?: $this->generateToken(trim($_GET['code']));
+                    if (!$this->generatedToken) {
+                        $this->generateToken(trim($_GET['code']));
+                    }
                 }
+
+                return $this->generatedToken;
             }
 
             // Handle session requests