Issue when renaming a node with different case.

[mazzimo]

If you rename a node with a different character case (Example: from "Page Title" to "page title"). the function "jumoo.usync.content.ContentEvents.SaveContentItemsToDisk" raises a "Source and destination path must be different" exception.

if ( (sourceName!= null) && (item.Name != sourceName ) )
                {
                    LogHelper.Info<ContentExporter>("Rename {0}", () => item.Name);
                    w.RenameContent(item, SourceInfo.GetName(item.Key));
                }

the following condition "renames" the content even when the content name is just changed from lowercase/uppercase. because windows filesystem is case insensitive, source and destination files got exactly the same name.