Test for obsfucation/identify obsfucation attempts about addons-linter

[magopian]

If there's a way to detect obfuscation (and minification!), and the validator returns a flag or something in the result, then that would help the backend tell the user he needs to either not minify/obfuscate, or at least attach the (unminified/unobfuscated) source code for reviewers.

[tofumatt]

Discussion on dev-js-tech-engine list, including mention of Caja: https://groups.google.com/forum/#!topic/mozilla.dev.tech.js-engine/qpALgoOftRw

[tofumatt]

I'm gonna close this as essentially way too big a project (people have done thesis papers on this and still concluded "it's really hard").