Set password secure and account keyboardType: emailAddress.
Validate input.
Auth after tap button.
Go to Login if need login.(no accoutn, delegate needLogin)
Define protocal: needLogin.
Extract auth.
Add voip UIBackgroundModes.
English tip.
Extract method `fetchLatestMessage` to IMCenter.
Refactor Chart view for fetchLatestMessages.
Fix local hide variable.
Clean JMasterViewController
Ooops, wrong condition for missAccount.