Add in response code logging

 `response_code` smallint(3) NOT NULL,
 should be appended to log table schema

Author: JCBuck

application/libraries/REST_Controller.php

@@ -494,7 +494,8 @@ public function response($data = NULL, $http_code = NULL, $continue = FALSE)
         }
 
         set_status_header($http_code);
-
+        $this->_log_response_code($http_code);
+        
         // If zlib.output_compression is enabled it will compress the output,
         // but it will not modify the content-length header to compensate for
         // the reduction, causing the browser to hang waiting for more data.
@@ -1512,7 +1513,20 @@ protected function _log_access_time()
 
         return $this->rest->db->update(config_item('rest_logs_table'), $payload, array('id' => $this->_insert_id));
     }
-
+    
+    /**
+     * updates the log with response code result
+     *
+     * @author Justin Chen
+     * @return boolean
+     */
+     
+    protected function _log_response_code($http_code)
+    {
+        $payload['response_code'] = $http_code;
+        return $this->rest->db->update(config_item('rest_logs_table'), $payload, array('id' => $this->_insert_id));
+    }
+    
     /**
      * Check to see if the API key has access to the controller and methods
      *