Navigation bar template
Added to TodoItem  priority = models.IntegerField() ( 0 is low and 2 is high) and expires = models.DateTimeField(null=True, blank=True)
1. Added UserResource.
2. Added UserObjectsOnlyAuthorization (the implementation copied from tastypie docs). Now TodoItemResource is using it.
3. Linked TodoItemResource to UserResource (ForeignKey).
Not doing document.write to create things, nor calling renderAllItems. Just ajax_getAllItems, and passing it {{request.user.pk}}.
v1 API now includes TodoItem and User.
1. TASTYPIE_DATETIME_FORMATTING, so that the API responses include timezone info.
1.ajax_getAllItems(current_user_id). It makes an ajax call to load everything in the beginning, and also displays things/sets handlers.
2. ajax_createItem is now ajax_createItem_async. Returns nothing. Displays ui, attaches callbacks.
3. _items is now window._items.
4. $(function(){}) is now only doing $("#main_item_list").sortable(). It actually happens before things are loaded - ok.