v1.6.0

The helpers can now be included as an AMD module alongside Dust 2.6.0 or newer.

New helpers:

• {@any}, which executes if any truth test in a {@select} block passes.
• {@none}, the opposite
• {@first}, executes on the first iteration of a loop
• {@last}... you get the idea

Removed helpers: https://github.com/linkedin/dustjs-helpers/wiki/Deprecated-Features

• {@if} (use other truth test helpers or context helpers instead)
• {@idx} (use {$idx}, a Dust core built-in, instead