Expose Result for Post-Processing

If a user needs to manipulate the files after upload, the resulting file paths should be exposed. These paths cannot be guessed from the request because the handler sanitizes the file name. This update also exposes a "complete" variable to easily determine if the file has been uploaded and combined.
Update PluploadHandler.php
Update PluploadHandler.php

Merged Results into the config array. Improved the scope of "cleanup" = false to keep completed file pieces. moved completed file cleanup code into the cleanup function, out of the write files functions. Made cleanup function public.
Merge pull request #1 from skibulk/patch-1

Test