More robust info

give the ability to view one particular property. show all attributes in the manifest. display in html by default or json if accept header is set
I certainly wouldn't want to blacklist anything that isn't well known and clearly not useful. But perhaps we should allow overriding/adding to/removing from the default blacklist. If modifying the blacklist is part of the API, I wouldn't mind if there wasn't a default blacklist whatsoever.