[SECURITY] Fedora 20 Update: mediawiki-1.21.3-1.fc20

MediaWiki is the software used for Wikipedia and the other Wikimedia Foundation websites. Compared to other wikis, it has an excellent range of features and support for high-traffic websites using multiple servers This package supports wiki farms. Read the instructions for creating wiki instances under /usr/share/doc/mediawiki/README.RPM. Remember to remove the config dir after completing the configuration.