Mention the ES6 Draft.
Newline.
Mention maps and sets.
Non-captialized.
Starker contrast for code color.
Fat arrow and promise.
Give the idea of chaining promises.
Iterables.
Relocate proxies.
Fat arrow → bind this.
ES6 comprehension updated syntax example.
Some remarks about ES6

Thanks to @webbedspace for this.

Fixes #5
Markdown bugfix