add attribute (listId) for get()

- add attribute (listId) for getAll() to search for items that contain
'listId' in listInfo
change attribute

- listName --> listId
modify & update & add

- store items & lists into session
- items and lists may change when event happens
- store listId into listInfo when an item is added to a selected list
- implement view_list AJAX function
add list_view function

- implement list_view function when 'view' button is pressed