1. myfile.dat was removed as the script supports any file to be downloaded from the upload directory

2. /upload and /download routes now support the secure_filename control to prevent malicious access to the filesystem

3. unnecessary test code (FILENAME costant) have been deleted
Merge branch 'master' of https://github.com/corso-python-prato/share-system-team2

Conflicts:
	server/server.py