adding CoffeeScript examples
adding CoffeeScript examples

AlexGach/nodebook,shapeshed/nodejsbook.io.examples,webskyer/nodejsbook.io.examples,tim-qian/nodejsbook.io.examples,shapeshed/nodejsbook.io.examples,xkris6x/nodejsbook.io.examples,xkris6x/nodejsbook.io.examples,shapeshed/nodejsbook.io.examples,webskyer/nodejsbook.io.examples,nuriozalp/nodejs,nuriozalp/nodejs,AlexGach/nodebook,tim-qian/nodejsbook.io.examples