new file:   lib/facter/apache_version.rb

setting up support for apache 2.4 which is the default on Fedora 18

new file:   lib/facter/apache_version.rb
        fact for apache version to decide which modules to enable
modified:   manifests/mod/dav_fs.pp
	enable dav_lock for apache 2.4
modified:   manifests/mod/default.pp
	set default mods for apache 2.4