Added dynamic wrapper support to IFileSystem to allow context specific implementations from which to hang extension methods upon (ie IMediaFileSystem)

src/Umbraco.Core/ObjectExtensions.cs

@@ -0,0 +1,24 @@
+namespace Umbraco.Core
+{
+    public static class ObjectExtensions
+    {
+        internal static T As<T>(this object realObject) where T : class 
+        {
+            if (realObject is T)
+                return realObject as T;
+
+            return DynamicWrapper.CreateWrapper<T>(realObject);
+        }
+
+        internal static T AsReal<T>(this object wrapper) where T : class
+        {
+            if (wrapper is T)
+                return wrapper as T;
+
+            if (wrapper is DynamicWrapper.DynamicWrapperBase)
+                return (T)(wrapper as DynamicWrapper.DynamicWrapperBase).RealObject;
+
+            return null;
+        }
+    }
+}