Added echo tasks to subtask.wordpress-migrate to help with debugging
Don't chown when uploading assets from dev

If the local files are owned by the webserver and not the user running
phing, they should still be readable. So changing file ownership
should be unnecessary.
Webserver user should be declared in the calling file rather than presume a Debian-like environment
Specify mysql credentials via defaults file

By passing the --defaults-file argument to mysql and mysqldump, user
credentials can be kept both private and external to Phing (and by
extension, out of version control).