Bugfix/#837 add http authorization (#848)

* Bugfix
- Fix: format initialization without composer
- Fix: Readme

* Make HTTP_AUTHORIZATION possible
- To hold backward compatibility HTTP_AUTHORIZATION and HTTP_AUTHANTICATION are possible

Author: Hanisch-IT

application/libraries/REST_Controller.php

@@ -2034,7 +2034,7 @@ protected function _prepare_basic_auth()
 
         // Returns NULL if the SERVER variables PHP_AUTH_USER and HTTP_AUTHENTICATION don't exist
         $username = $this->input->server('PHP_AUTH_USER');
-        $http_auth = $this->input->server('HTTP_AUTHENTICATION');
+        $http_auth = $this->input->server('HTTP_AUTHENTICATION') ?: $this->input->server('HTTP_AUTHORIZATION');
 
         $password = NULL;
         if ($username !== NULL)