Create Wordpress install profile

Since we are investing a lot of time in making sure that Backdrop has the same features as Wordpress #1388 and that Wordpress sites can be easily imported into Backdrop #1055, we should probably have an install profile that configures the site in a way that mimics what you get with a Wordpress site out of the box, including the proper content types, taxonomies, layouts, and blocks. That way, someone looking for a Wordpress replacement has something familiar to use as a jumping off point from which to make the changes that they are looking for.