udpated xdebug to 2.2.3
5.3.28
put phpunit last again
add opcache from pecl
added opcache ini file
use correct path to extension dir
don't load opcache by default
Merge branch '5_3_mountainlion' into 5_4_mountainlion

* 5_3_mountainlion:
  don't load opcache by default
  use correct path to extension dir
  added opcache ini file
  add opcache from pecl
  put phpunit last again
  udpated xdebug to 2.2.3