End support for PHP 5.5 [MAILPOET-1317]

lib/Models/Model.php

@@ -292,15 +292,6 @@ class Model extends \Sudzy\ValidModel {
     return static::whereNotNull('deleted_at');
   }
 
-  /**
-   * PHP 5.3 fix for incorrectly returned model results when using asArray() function.
-   * Jira reference: https://goo.gl/UZaMj5
-   * TODO: remove after phasing out PHP 5.3 support
-   */
-  function asArray() {
-    return call_user_func_array('parent::as_array', func_get_args());
-  }
-
   /**
    * Rethrow PDOExceptions to prevent exposing sensitive data in stack traces
    */