added wiselinks_canonical method
address wiselinks_robots wiselinks_link_rel_prev wiselinks_link_rel_next
if I have custom pages for 404 or 500 as well as giving http status code I still want to show the result of my custom page that can be handle page:fail with one more parameter
Merge pull request #68 from cfiorini/meta_url

Added more stuff for SEO techniques