Adds Rakefile to provide a nicer command line interface for the recipes.
The Rakefile now has two tasks:

1) rake / rake list
It shows all recipes available in the repository.

2) rake compile[recipe_name.rb]
It compile the recipe given as argument to the rake task.
Note that with some shell (for example zsh) you have to type:

rake 'compile[recipe_name.rb]'

to execute the task correctly.

]