slight refactoring of persona methods:
- externalizing onlogin onlogout callbacks
- $.post promises instead of callbacks
- throw error instead of just logging
moving entities search views from app/views/items/form to app/views/entities
- introducing the scanner for mobiles
- book entities search make room for non wikidata entities
- book_li refresh when pictures arrive
- finishing to move entities search files from views/items/form to views/entities
- introducing image_handler helpers
- adding item data manipulation methods to item.coffee
in an attempt to ease its standard processing
- inventory item_show developments
- listing_picker partial
- working on the workflow for item creation from entities
- wikidata entities request Google Books image