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

[richtr]

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 (in addition to being able to run as a .nex file in Opera > 12.15 of course). ;)

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).