names of low-level modules always explicit in define
added `amber/helpers`, you can popup Helios conveniently

Use `require('amber/helpers').popupHelios()`.
Merge pull request #663 from herby/helpers-in-popup-helios-possible

added `amber/helpers`, you can popup Helios conveniently
Merge pull request #662 from herby/names-in-define

names of low-level modules always explicit in define