terminals management

*add [cancelled, repair, trash] status to terminal
*add operate log to terminal
*admin can cancel, repair, trash terminal
*merchant can cancel terminal
statics: messages

*add model MessageWarning
*add controller MessageWarningsController
group management
group management and statictis

*add tabs to admin layout
Merge branch 'group_and_stock' into develop

Conflicts:
	config/deploy.rb