Update setup.yml to use "remote_user" instead of deprecated "user"
Tweak README text
Make default MySQL db use utf8_unicode_ci collation, rather than less robust utf8_general_ci
Shift away from having the VM download a remote copy of the WP software to using a locally stored copy instead. Should be nicer for offline use. Included copy is WP 4.0.
Update README to reflect it's using local copy of WP software now
Switch to using official Ubuntu box distributed via Vagrant Cloud, so users don't need to do any further downloading or configuration to get up and running with the default configuration
Tweak README
Another README tweak