HF of previous relese

- All calculation methods synchronus

- T/H method added to AFArray

- FIX: gfor actually works

- gfor unit test added

- Removed (mis)feature: scope cannot be async

- FIX: scope returns correct value

- scope.register exposed as public API (unit test added)

- core ES6 support changed to Node 5 feature matrix, legacy support switched to Babel

RAII support by scope

math function fixes

mod export fixed

0.17.1