Days_Event - support events (Observer pattern)

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Days_Event - implementation of Observer pattern.

Now available in SVN. please, help me test it (write unit tests) and
intergate it into system.

I describe idea on http://code.google.com/p/phpdays/wiki/EnIdea page.
Please, help me add calls of Days_Event::run('event_name', array
(...event_parameters...)) to all files in Days library.

I have create separated services without User database. In main
application we add user support (logging, register, etc). In forum and
blog services we add calls Days_Event::add('user_login_success', array
($this, 'userLogged')). In userLogged() method we execute additional
actions for logged users only.

Also learn how it implemented in other frameworks.

[Pro PHP]

See Also:
* http://devzone.zend.com/article/4284-Observer-pattern-in-PHP
* http://www.yiiframework.com/forum/index.php?/topic/3679-some-system-events/
* http://docs.kohanaphp.com/general/events