Add OEX compatibility to conversion process + ship minified versions of the JS library files

With these commits a developer can, if they wish to, zip up a .nex converted output directory as a .oex file and this .oex file containing the .nex code _will run successfully in Opera versions <= 12.15_. ;)

This pull request supersedes pull request #8 (if you merge this fix then we can discard pull request #8 since it includes the same commits as this super-set pull request).