TODO

TODO:

-- Do not use C rand(), allow user to supply data (or generator) somehow
   Perhaps allow separate new_rand(), new_callback() and new_data(data) constructors.
-- Add perlin:turbulence()
-- Add perlin:fractalsum()
-- Add old (before-improved) Perlin noise as a separate algorithm
-- Allow optional init with Perlin's original permutation data (new_perlin())
-- Add simplex Perlin noise (as a separate algorithm)
-- Add Worley noise
-- Write Makefile
-- Write some tests
-- Write readme
-- Add some benchmarks
-- Fix LuaJIT interaction