Add support for duplicate filenames

[DeveloperKid]

Hey guys,

i build myself a solution for duplicate files/filenames on the server.
Works pretty well atm on my machine, maybe have a look at it.

            int k = 1;
            while (File.Exists(path1 + "\\files\\" + fileInfo.name))
            {
                if (fileInfo.name.IndexOf("Copy " + (k - 1) + " of ") >= 0)
                    fileInfo.name = fileInfo.name.Replace("Copy " + (k - 1) + " of ", "Copy " + k + " of ");
                else
                    fileInfo.name = "Copy " + k + " of " + fileInfo.name;
                k++;
            }

[blueimp]

Thanks for the contribution, @DeveloperKid.
While I usually don't add additional server-side upload handlers, if you provide a link (the github project page?) I can add it to the Wiki.