Small change to be able to install on Joomla 3.0 with Seblod 2.4.9.5

This is a small fix in order to be able to install the plugin to Joomla 3.0 and Seblod 2.4.9.5
Merge pull request #2 from griiettner/master

Fix to install J3 and Seb 2.4.9.5