So, the instructions say to just copy db.php to the wp-content folder.. but in doing so, it causes a fatal as it does:
require( dirname( __FILE__ ) . '/inc/error-handler.php' );
Using a symlink works perfectly (
db.php -> plugins/wp-db-driver/db.php), but that doesn't work with Grunt, when Grunt copies it to the build directory, it alters it from a symlink to a direct file copy.
For now I've hard-coded it to a full path locally, I don't really see an easy way to fix this aside from a file_exists() and assuming the plugin directory location (the Plugin DIR constants are not yet available)