Hi, Matt C
There is a more recent version in github, including tables and other minor changes.
Additional to add in the option menu of gvim wiki
cat ~/.vim/synmenu.vim an 50.150.450 &Syntax.WXYZ.Wiki :cal SetSyn("mediawiki")<CR>
--September 8, 2015
In general, only autocmds used to detect the filetype should be placed in ftdetect directory. All the filetype-specific settings and bindings should be placed under ftplugin. I see that upstream currently says what to put where correctly. But version 3 of the script has all that pasted together in ftdetect which results in those settings being always applied to the very first buffer opened, regardless of what does it contain. And only to the first one. — Nov 25, 2015.