server: Emit scores with hash value.

We'll ultimately be using this as another trait to classify users by
(whether the avatar has been seen before).  The UI will therefore need
this information.

hadsh/server.py

@@ -242,8 +242,14 @@ class AvatarHashHandler(AuthRequestHandler):
                 db.commit()
 
             self.set_status(200)
-            self.set_header('Content-Type', 'text/plain')
-            self.write(avatar_hash.hashstr)
+            self.set_header('Content-Type', 'application/json')
+            self.write(json.dumps({
+                'id': avatar_hash.hash_id,
+                'algo': avatar_hash.hashalgo,
+                'hash': avatar_hash.hashstr.decode(),
+                'score': avatar_hash.score,
+                'count': avatar_hash.count
+            }))
             self.finish()
         finally:
             db.close()