Rename CoffeeMaker class

[valtzu]

CoffeeMaker as a class name sounds a little goofy. Let's use CoffeeMachine or some other instead. Also, we need to add a hyphen to the module name (f.e. "coffee-machine.js")

[valtzu]

I just figured out coffeemaker is one word but coffee machine is two words. So the fix should be Coffeemaker class in coffeemaker.js file or CoffeeMachine in coffee-machine.js file.