Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/mu-plugins/pantheon-mu-plugin/inc/pantheon-network-setup.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Network Setup
+ *
+ * @package pantheon-mu-plugin
+ */
+
+namespace Pantheon\NetworkSetup;
+
+/**
+ * Alter network setup pages to include Pantheon-specific instructions.
+ */
+
+/**
+ * Replace the WordPress core Network Setup page from the Settings menu.
+ */
+function pantheon_remove_network_setup() {
+	global $submenu;
+	if ( isset( $submenu['tools.php'][50] ) ) {
+		unset( $submenu['tools.php'][50] );
+	}
+}
+
+/**
+ * Register the Pantheon network setup submenu page.
+ */
+function pantheon_add_network_setup() {
+	add_management_page(
+		__( 'Create a Network of WordPress  Sites', 'network-setup' ),
+		__( 'Network Setup', 'network-setup' ),
+		'setup_network',
+		'setup_network',
+		__NAMESPACE__ . '\\pantheon_render_network_setup_page'
+	);
+}
+
+/**
+ * Render the Pantheon network setup page.
+ */
+function pantheon_render_network_setup_page() {
+	global $wpdb;
+	require_once __DIR__ . '/network/network.php';
+}
+
+add_action( 'admin_menu', __NAMESPACE__ . '\\pantheon_remove_network_setup' );
+add_action( 'admin_menu', __NAMESPACE__ . '\\pantheon_add_network_setup' );