Better support for github links
Better support for github links

Github links that are the subdir of a known parent now fallback to the most
specific parent.

euank/EuIrcBot,LinuxMercedes/EuIrcBot,brhoades/EuIrcBot,brhoades/EuIrcBot,gmackie/EuIrcBot,euank/EuIrcBot,gmackie/EuIrcBot,LinuxMercedes/EuIrcBot