Make this be require-able via Composer for portability

[bradymwilliams]

Example: https://github.com/johnpbloch/wordpress Which installs https://github.com/johnpbloch/wordpress-core

and is requirable in composer like

"johnpbloch/wordpress": "x.x.x",

[greg-1-anderson]

See https://github.com/pantheon-systems/wordpress-composer and https://github.com/pantheon-upstreams/wordpress-project.

We'll be coming out with a supported version based on Bedrock in the future.

[scottbuscemi]

We are now in EA for the WordPress Bedrock Composer upstream: https://github.com/pantheon-systems/wordpress-composer-managed

If you'd like to participate in the EA program, please fill out this form: https://docs.google.com/forms/d/e/1FAIpQLSe5WvxnzA7_U7B4clhhIYsPxI7DXkmQC-Y8J6pXmrbHYPzviw/viewform