Updating the 'powered by' icons to both say 2.4 as well as use Apache 2.0 licensed fonts only.

SVG version also added, in case someone wants to use/change/reproduce the icons.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1392973 13f79535-47bb-0310-9956-ffa450edef68