Added support for PHP 5.3
- PHP 5.3 didnt liked $foo = array('class', 'method'); $foo('stuff');
  So I had to use call_user_func :(
- Added a short README, I'll rewrite it tomorrow, when I have more time
- Minor changes to the TokenMap::add method.
- Added method to overwrite a token function.
- Removed unneeded conditionals on the Paragraph processor.
- Added Tests for Luthor functionality