ignore multisite blogs.dir directory (holds uploaded media from network sites)

Wordpress.gitignore

@@ -25,6 +25,7 @@ xmlrpc.php
 wp-admin/
 wp-includes/
 wp-content/uploads/
+wp-content/blogs.dir/
 wp-content/upgrade/*
 wp-content/backup-db/*
 wp-content/advanced-cache.php