Improve unittesting by means of Saucelabs and Codeclimate

[evilaliv3]

I would suggest that in order to verify the compatibility of the library with the various trargetted browsers and in order to keep track of various code quality indicator you could implement integration with Saucelabs and Codeclimate

i'm thinking this while evaluating the validity of the webcrypto-shim for the integration in openpgp.js (https://github.com/openpgpjs/openpgpjs/issues/428), and i've right know implemented what i'm suggesting to you for the https://github.com/indutny/elliptic project: https://github.com/indutny/elliptic/pull/80

It would be great if you could do the same!

[Ruffio]

@evilaliv3 how about making a PR for this?