Add support for an anonymous OAuth consumer. Note: this requires a

small DB tweak.  Oauth_application_user needs to have the primary
compound key: (profile_id, application_id, token).

http://status.net/open-source/issues/2761

This should also make it possible to have multiple access tokens
per application.

http://status.net/open-source/issues/2788

db/statusnet.sql

@@ -231,10 +231,10 @@ create table oauth_application_user (
     profile_id integer not null comment 'user of the application' references profile (id),
     application_id integer not null comment 'id of the application' references oauth_application (id),
     access_type tinyint default 0 comment 'access type, bit 1 = read, bit 2 = write',
-    token varchar(255) comment 'request or access token',
+    token varchar(255) not null comment 'request or access token',
     created datetime not null comment 'date this record was created',
     modified timestamp comment 'date this record was modified',
-    constraint primary key (profile_id, application_id)
+    constraint primary key (profile_id, application_id, token)
 ) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin;
 
 /* These are used by JanRain OpenID library */