list default guestbook
add button SIGN
Change GuestbookWidget to GreetingWidget, implement post a new greeting
update greeting
add CSS, verify login at API
switch guestbook, sign new guestbook
remove alert
set role
delete alert

delete alert
Reload after update

Reload after update
check condition for update Greeting in PUT method
load data in postCreate; call startup() after place widget to domNode
check variabl naming
use DocFragment to load data
check empty of request POST
remove unnecessory code, format HTML files
Create GreetingStore to connect API

Create GreetingStore to connect API
Wrong inherited
Use Deferred to call API
Remove unneccesory codes