Fixed a problem with twig gets installed into the wrong directory

In Debian we have /usr/share/php in the include_path of php. The directory
/usr/share/php5 serves a completely different purpose, than containing code
written php.
Fixed a problem with twig C extension not working

...since twig.ini got not installed in /etc/php5/mods-available/
Merge branch 'feature/reprocess-initial-debian-packaging' into feature/re-add-twig-doc