Fixes the filenames returned by the quickshare thumbnail GET webscript to match the original node's filename and using the appropriate file extension for the thumbnail's mimetype.

Alfresco Repo module which modifies the quickshare thumbnail GET webscript to send the filename of the thumbnail's source node (e.g. "my.pdf") instead of the name of the thumbnail itself (e.g. "pdf" if the thumbnail is called "pdf") in the Content-Disposition header, when the content is being requested as an attachment (e.g. download).

This is so that the thumbnail can be downloaded by a browser with an appropriate filename.