More ES6

[Raynos]

Shims that can probably be included :

• WeakMap shim
• Object.is
• Number.isFinite
• Number.isNaN
• Number.isInteger

Open for discussion :

• Sets and maps
• Module loaders
• Function.prototype.toString

[rauschma]

Thanks! Will consider in due time.

[Deleted user]

I haven't really refined or tested these but figured it was at least mentionable in this context: https://github.com/Benvie/ES6-Harmony-Collections-Shim

[rauschma]

@Benvie, @Raynos: Take a look here and consider contributing:
https://github.com/paulmillr/es6-shim