Unique monad transformer for Akh Javascript Monad library

Api

The unique transformer UniqueT and the base list type Unique allow getting a unique number from state.

Importing:

// Unique monad
require('akh.unique').Unique
require('akh').Unique
require('akh').type.unique

// Unique monad tranformer
require('akh.unique').UniqueT
require('akh').UniqueT
require('akh').trans.unique