we're not relying on overriding url::site() to do tricks around item
urls. This means that you won't get item urls by doing
url::site("albums/37"), for example, but it also means that we won't
get pretty urls where we don't expect them (like in the action of a
<form> element).
Incidentally, this will help us move over to using the slug format
because if you've got a bad character in a url, the edit forms will
now work on it since they'll be id based.
approach using html::specialchars and purify uses HTMLPurifier to intelligently
cleanse the output fields. Use purifier for text and title fields where it is
likely that a user would enter html to format their data.
