rook 0.2.1

Rook is a SCM tool like Make, Rake, Ant, Cons, and so on. Rook is inspired by Cook which is written by Peter Miller. http://www.canb.auug.org.au/~millerp/cook/cook.html Rook regard software building as Cooking. * Target file is called `Product' * Required file to build is called `Ingredients' * Task to build is called `Recipe' * Script file to build software is called `Cookbook'