Refactoring Content/Media and ContentTypes/MediaTypes so the two are as close as possible. By doing this Media and Content are practically the same witht the except of a few properties.

This implements U4-10

src/Umbraco.Core/Models/IContent.cs

@@ -33,6 +33,11 @@ namespace Umbraco.Core.Models
         /// </summary>
         DateTime? ExpireDate { get; set; }
 
+        /// <summary>
+        /// Gets the ContentType used by this content object
+        /// </summary>
+        IContentType ContentType { get; }
+
         /// <summary>
         /// Changes the <see cref="IContentType"/> for the current content object
         /// </summary>