plugin requires PHP 5.4, which exceeds CakePHP requirements

The usage of the [] array syntax is new to PHP 5.4 and until CakePHP requires PHP 5.4 it it should be avoided. Its also unclear if this follows the [CakePHP Coding Standards](http://book.cakephp.org/2.0/en/contributing/cakephp-coding-conventions.html)

This only been tested down to PHP 5.3.3.