Fixed autoloader for composer and pear installations

Removed all the require_once and make the autoloader load the given classes

Fixed autoloader for:

* Composer instalation
  * Loading composer autoloader if founded

* Composer git clone
 * Loading composer autoloader for a git clone (different directory level path)

* PEAR
 * Setting the include path
 * Loading the pdepend autoloader

This change was made due to the fact that phpmd was not working in my project with composer installation