[#6484] ticket:492 Move mediawiki import script to separate repo
[#6484] ticket:492 Move wiki_from_trac script to tracwikiimporter
[#6484] Update / add requirements for TracWiki and MediaWiki importers

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#6484] Fix missing = in requirements-sf.txt
[#6484] Fix case error in requirements-sf.txt