Feature: First running version of centralized php-modules.ini generation

WIP, not yet tested!

I centralized the <module>.ini generation in php_pecl :setup - with a dynamic detected path to the php module dir and support for config variations. 

@till I dont think I will test this PR completely today. Since I will be on sick leave next week, maybe you want to take over here. 

Currently tested: generation of config files for php-xdebug is correct for both php5.3 and php5.5 in Vagrantbox.