Remove wordpress-default from base repository in favor of wp-cli

WP-CLI allows for more flexibility when setting up an initial development environment for WordPress. Removing the wordpress-default directory allows for us to start prepping for this addition
No longer need to ignore the wordpress-default directory
Initial installation and use of wp-cli to setup default WordPress

Download and install WP-CLI, then use it to download and configure a default WordPress environment to start the vagrant with.
Install wp-cli and use it to configure an initial WordPress setup

This replaces our original WordPress setup that had been included with the repository with an installation of wp-cli. Wp-cli allows us to install a custom configuration on the fly and will go a long way toward an environment where WordPress installs can be setup dynamically.

SO SWEET!