CHANGE the stub for rosetta's latest release object to include the zip/tar size and urls as required by download-sidebar.php
global.wordpress.dev: Use direct array values instead of constants.

WP_CORE_STABLE_BRANCH is a defined as a constant because it's a constant in production, but the other values don't
need to be constants.

Also switched tabs to spaces, per the coding standards.
Clarify that user should clone WME repository instead of VVV.
Merge branch '1'
global.wordpress.dev: Add screenshot_url() stub.