Bug1073498 - Use alert screen prompt when user isn't logged and make a call from contact

Yes, this code is necessary too.
The user case is:
 * User starts loop and logs in
 * User closes the app
 * User places a call from contact
 * The loop app will be started and received the activity
 * When the handler is executed, loop will not be log in and will show the message (but this screen will never be actually shown!)
 * As the user closed the app without logging out, the login will occur automatically without user intervention, the login event will be received and the call will proceed.
 * When the user finishes the call, he'll see the dialog screen that wasn't closed