Some small updates to allow PHP 5.3 users to use this library.

Hey thanks a bunch for writing this bundle, but I like so many others are limited by our environments to PHP 5.3.3 due to RHEL ridiculousness.

To that end, I have modified this bundle to make it PHP 5.3 compatible.  There are some misc comment changes as well that are not required by any means.  The update to the PHP req in composer.json and the modification of the array definition from "[]" to "array()" are required, however.

I also added a few Symfony packages to the dev dependencies just to make IDE's complain less.

Let me know what you think!