SchumacherFM/Magento-Markdown — pull request #27 by Gibbs (2014-03-13 19:27:03+00:00)
Title: Remove shortened array syntax (PHP 5.4 feature)

Quick fix but will result in PHP 5.2 being supported as stated in the readme. You might want to bump that up to PHP 5.3 as listed on the PHP downloads page.