Image should not dispose of stream. Fix #316

Former-commit-id: 7818c6866549f63bd8964f1c6650b5deb938f25c
Former-commit-id: dfa8dfabf96353a6cde86386d87fd57360eb1df0
Former-commit-id: 3739eafa2260dc0e6ab9f292c7905a5f04e6765e

src/ImageProcessorCore/Image.cs

@@ -229,8 +229,6 @@ namespace ImageProcessorCore
         /// Thrown if the stream is not readable nor seekable.
         /// </exception>
         private void Load(Stream stream, IList<IImageFormat> formats)
-        {
-            try
         {
             if (!stream.CanRead)
             {
@@ -272,10 +270,5 @@ namespace ImageProcessorCore
 
             throw new NotSupportedException(stringBuilder.ToString());
         }
-            finally
-            {
-                stream.Dispose();
-            }
-        }
     }
 }