var Class = function(){
  var klass = function(){
    this.init.apply(this, arguments);
  };

  klass.prototype.init = function(){};

  // Shortcut to access prototype
  klass.fn = klass.prototype;

  // Shortcut to access class
  klass.fn.parent = klass;

  // Adding class properties
  klass.extend = function(obj){
    var extended = obj.extended;
    for(var i in obj) {
      klass[i] = obj[i];
    }
    if (extended) extended(obj)
  };

  // Adding instance properties
  klass.include = function(obj) {
    var included = obj.included;
    for (var i in obj) {
      klass.fn[i] = obj[i];
    }
    if (included) included(klass)
  };

  return klass;
};