Refactor to ES6 syntax and standards

[TimMikeladze]

The Javascript can be updated to use ES6 syntax and modules.

[NorthDecoder]

Agreed @TimMikeladze . And here are some references to help us with that:

• es6-features
• compat-table
• caniuse
• practical-modern-javascript a book
• TL;DR 😸 ECMA-262 6th edition