make useCoffee option actually work

Fixed the `useCoffee` option to actually work. The `extensions` and `coffee` parameter are not actually used in the `jasmine.executeSpecsInFolder` method. These are parsed and setup similarly to what I added here in the jasmine-node cli.js file. My recommendation is to look at refactoring this into the `executeSpecsInFolder` method somehow in the jasmine-node project. For now, this will work.