Updating schema version to 12 and adding migration script.

servatrice/migrations/servatrice_0011_to_0012.sql

+-- Servatrice db migration from version 11 to version 12
+
+alter table cockatrice_users modify token binary(16) NULL;
+
+UPDATE cockatrice_schema_version SET version=12 WHERE version=11;

servatrice/servatrice.sql

@@ -20,7 +20,7 @@ CREATE TABLE IF NOT EXISTS `cockatrice_schema_version` (
   PRIMARY KEY  (`version`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
 
-INSERT INTO cockatrice_schema_version VALUES(11);
+INSERT INTO cockatrice_schema_version VALUES(12);
 
 CREATE TABLE IF NOT EXISTS `cockatrice_decklist_files` (
   `id` int(7) unsigned zerofill NOT NULL auto_increment,