Use AR callbacks instead of observers (removed in Rails4) for notifications.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@12021 e93f8b46-1217-0410-a6f0-8f06a7374b81
Additional tests for AccountController.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@12022 e93f8b46-1217-0410-a6f0-8f06a7374b81
Updates for 2.3.2 release.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@12024 e93f8b46-1217-0410-a6f0-8f06a7374b81