Renamed all files to lowercase, for workshop compatibility

Unfortunately this makes the history harder to find for the files, even though this is as proper of a git rename as it gets. Apparantly `git log --follow` will track changes between file renames, but Github and most clients don't by default. 

http://stackoverflow.com/a/4302235 Linus Torvalds says basically 'deal with it, file history is useless, only entire project history (lists of commits) matter.'