Add commonjs, es6, umd build supports

[wuweiweiwu]

• use rollup for umd build (now 91k v 109k)
• create es build
• create commonjs build
• update dependencies
• update README

follow up to: #271

[coveralls]

Coverage decreased (-0.5%) to 75.019% when pulling 4edf51c on wuweiweiwu:es-commonjs-umd into c844c04 on frontend-collective:master.