Detect reconnect.
Update project setting.
Refactor project groups.
IMCenter: single instance.
Init IMCenter with sharedInstance.
Apply sharedInstance on MasterView.
Apply sharedInstance into DetailView.
Apply sharedInstance to LoginView.
Send notification on receiving message.
Receive message by noti.
Send notification on receiving message.
Inherit XMPPMessageArchivingCoreDataStorage.
register Notification Observer.