"Mark All As Read" feature for gmail imap client

[Rajiv]

Gmail4j now supports mark all message as read functionality for gmail
imap
client. This new feature can be used used as the following:

GmailConnection conn = new ImapGmailConnection();
configure connection
GmailClient client = new ImapGmailClient();
client.setConnection(conn);
client.markAllAsRead();

This feature could be used with Gmail4J Next.
see (http://code.google.com/p/gmail4j/issues/detail?id=17)