Tracking changes

[fairking]

Would be cool if PetaPoco could track changes and update only columns which have been changed.
There is a nice example how to acheve it: https://gist.github.com/fairking/7c07a5af6af49d5da8ccd285020a66ec
In the same way how nhibernate is doing it, but in much simple way.
Example:

public class Article
{
    public virtual int Id { get; set; }
    public virtual string Name { get; set; }
    public virtual string Description { get; set; }
}

var article = db.Single<Article>(123); // Returns proxy

article.Name = "Other name";

Db.Update(article); // Produces: update article set name = 'Other name' where id = 123;
// No description included into the query
// All article's changes are flushed after the update.