ES6 modules

[thisconnect]

Would you consider using ES6 modules?

Related three.js just moved to ES6 modules mrdoob/three.js#9310

[doxiaodong]

+1, ES6 module can use tree-shaking with webpack2.

[htryggva]

+1 We would really like to have this as well

[Frexuz]

Possible :P Can close issue

[sethmfuller]

See crypto-es

[jahed]

For reference, PR is here: #236