src/main/java/com/googlecode/objectify/Ref.java
public static <T> Ref<T> create(T value) {
		Key<T> key = Key.create(value);
		return create(key);
	}
public static <T> Ref<T> create(T value) {
		Key<T> key = Key.create(value);
		return create(key);
	}
Creates a Ref from a registered pojo entity