Add etherpad_group column in db

docs/schema.mysql

@@ -9,6 +9,7 @@ CREATE TABLE `rooms` (
   `ask_for_name` tinyint(1) DEFAULT '0',
   `join_password` varchar(160) DEFAULT NULL,
   `owner_password` varchar(160) DEFAULT NULL,
+  `etherpad_group` varchar(40) DEFAULT NULL,
   `token` varchar(160) DEFAULT NULL,
   `realm` varchar(160) DEFAULT NULL,
   `persistent` tinyint(1) DEFAULT '0',

docs/upgrade.mysql

@@ -21,3 +21,4 @@ CREATE TABLE IF NOT EXISTS `invitations` (
   `timestamp` int(20) DEFAULT NULL,
   PRIMARY KEY (`token`)
 ) DEFAULT CHARSET=utf8;
+ALTER TABLE `rooms` ADD COLUMN `etherpad_group` varchar(40) DEFAULT NULL AFTER `owner_password`;