Mixin.js

jet.mixin = function(/*Object*/ target, /*Object*/ source){
	for(var prop in source){
		if(source.hasOwnProperty(prop) && (!(prop in target) || target[prop] !== source[prop])){
			if(typeof source[prop] === "object"){
				target[prop] = jet.mixin(target[prop], source[prop]);
			} else {
				target[prop] = source[prop];
			}
		}
	}
	return target;
}