Sitecore automatic datasource builder. To use it, Drop the config file into App_Config/Includes folder. Use ./Components as your sublayout/rendering Datasource.

RelativeDatasource.cs

using Sitecore.Data;
using Sitecore.Data.Items;
using Sitecore.Data.Managers;
using Sitecore.Pipelines.GetRenderingDatasource;
using Sitecore.SecurityModel;
using Sitecore.Sites;
using Sitecore.Text;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Site.Web.Pipelines
{
    /// <summary>
    /// This pipeline is envoked everytime there is a component being added on a page. This pipeline ensure's the components are created right under the article/page within the Components folder. There is also a Web.config entry for this.
    /// Refer https://jermdavis.wordpress.com/2014/02/21/improving-your-sitecore-ia-with-relative-datasource-locations/ for more info.
    /// </summary>
    public class RelativeDatasource
    {

        private static ID DataSourceLocationField = new ID("{B5B27AF1-25EF-405C-87CE-369B3A004016}");
        private static ID FolderTemplateID = new ID("{A87A00B1-E6DB-45AB-8B54-636FEC3B5523}");
        private static TemplateID FolderTemplate = new TemplateID(FolderTemplateID);
        private static string RelativePath = "./";
        private static string FolderName = "Components";
        public void Process(GetRenderingDatasourceArgs args)
        {
            if (args == null)
            {
                throw new ArgumentNullException("args");
            }
            string dataSourceLocation = args.RenderingItem.Fields[DataSourceLocationField].Value;

                if (string.IsNullOrWhiteSpace(dataSourceLocation))
                {
                    return;
                }

                if (!dataSourceLocation.Contains(RelativePath))
                {
                    return;
                }

                if (string.IsNullOrWhiteSpace(args.ContextItemPath))
                {
                    return;
                }

                string subFolderPath = args.ContextItemPath + "/" + FolderName;

                if (args.ContentDatabase.GetItem(subFolderPath) != null)
                {
                    return;
                }

                Item currentItem = args.ContentDatabase.GetItem(args.ContextItemPath);

                if (currentItem == null)
                {
                    return;
                }


                using (new SecurityDisabler())
                {
                    currentItem.Add(FolderName, FolderTemplate);
                }
        }
    }
}

Site.Web.Config

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <pipelines>
      <getRenderingDatasource>
        <processor patch:before="processor[@type='Sitecore.Pipelines.GetRenderingDatasource.GetDatasourceLocation, Sitecore.Kernel']" type="Site.Web.Pipelines.RelativeDatasource, Site.Web"/>  
      </getRenderingDatasource>
    </pipelines>
  </sitecore>
</configuration>