Handle actual photo uris

Addressing the StackOverflow question (http://stackoverflow.com/questions/21157630/picasso-loads-photo-thumbnail-uri-but-not-photo-uri/21214524) where Picasso would not be able to deal with direct high-res photo uris. Picasso can fetch these if a contact or lookup uri is used, but fails if the uri points directly AT the contact's high resolution photo and not the contact.