Integrate the CoffeeScript Compiler for .coffee files

Simple integration of CoffeeScript support. The code uses the JavaScript
implementation of the CoffeeScript compiler. All *.coffee files get
compiled to JavaScript just before eval(). Additionaly a new command
named /coffe is introduced to run CoffeeScript code straight in the
Minecraft console.
Merge pull request #91 from arg-games/coffeescript-integration

Integrate the CoffeeScript Compiler for .coffee files