Transfers PFFiles hosted on parse.com (files.parsetffs.com) to your self-hosted parse-server by simply downloading, re-uploading them and saving the object again. Beware that this will cause all of your rows containing a PFFile to get a new updatedAt date
To run, make sure you install the dependencies using composer.phar install
Edit the constants found in migrate.php, also edit the $mapping
variable to match your classes and column names that contains PFFile's