Refactor Saves to Use Closures

Refactor save operations to not rely on the createSave() and createDelete() methods. All this logic should be contained within save() and delete(). In addition, this would allow us to remove the whole operations API, which is one less thing people have to worry about and learn.

We should be able to accomplish this by creating a object that executes a closure function.

public class Entity
{
    public function save(validate:Boolean):AsyncToken
    {
        var token:AsyncToken = new AsyncToken();
        var closure:Function = function():void
        {
            if (validate && isInvalid()) {
                token.fault();
            }
            
            var resultHandler:Function = function(result:ResultEvent):void
            {
                token.result(result);
            }
            var faultHandler:Function = function(fault:FaultEvent):void
            {
                token.fault(fault);
            }
            var adaptorToken:AsyncToken = isNew ? adaptor.create([this]) : adaptor.update([this]);
            
            adaptorToken.addResponder(new AsyncResponder(resultHandler, faultHandler));
        }
        return token;
    }
}