Use latest Graph API (v17.0) and enable parameter to choose version from caller

Author: henriquemattos

FacebookStrategy.php

@@ -8,7 +8,7 @@ class FacebookStrategy extends OpauthStrategy {
         'scope' => 'email', // Default scope for necessary permissions
     );
 
-    private $api_version = 'v12.0'; // Update to the latest supported version
+    private $api_version = 'v17.0'; // Update to the latest supported version
 
     public function request() {
         $params = array(
@@ -119,6 +119,10 @@ private function me($access_token) {
             $fields = $this->strategy['fields'];
         }
 
+        if (!empty($this->strategy['api_version'])) {
+            $this->api_version = $this->strategy['api_version'];
+        }
+
         $me = $this->serverGet(
             "https://graph.facebook.com/{$this->api_version}/me",
             array(