1) The item_updated event no longer takes the old and new items.
Instead we overload ORM to track the original data and make
that available via the item. This will allow us to move event
publishing down into the API methods which in turn will give us
more stability since we won't require each controller to remember
to do it.
2) ORM class now tracks the original values. It doesn't track
the original relationships (no need for that, yet)
3) Added new events:
item_deleted
group_deleted
user_deleted
* Allow for the "movie" type in all of our text
* Try to follow the pattern of mainly only passing ORM objects
to the view and let it generate its own text (this becomes
even more important when 3rd parties want to customize notification
messages)
* Rename _send_message to be _notify_subscribers to be more acccurate
and have it explicitly take a subject in the API
* Use Item_Model::url() in the views instead of hand crafting URLs
* Reformat HTML in views
* Use $comment->author_xxx() functions instead of replicating that code
* Fix several places where we were encoding data by doing ucfirst($item->type)
with conditionals where we form the text properly. We should *never*
be showing data types to the end user! This is not localizable!
Note that this probably breaks the existing batch processing code. I
am going to redo that in a subsequent pass.
