remove broken packages install

The ext packages need to be redone properly, in the end webapp_config
will need to be able to configure the extensions needed on a per wiki
base. The ebuilds i have right now are not worth very much since they
install into the mediawiki source location.
version bump for mediawiki
disable proxy-html mapping

I'm doing this on the backend in mediawikis config since it work better
that way.