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

Yeah, and the pending activities will be removed, but this is needed because:
* User starts loop
* User logouts from loop (but he doesn't close the app).
  If at this moment there was a pending request it'll be removed, as you say. But _isLogged will still be true.
* User makes a call from contact.
  The handler will attend the request and since _isLogged is true (if I remove this handler it'll be) then the activity will be executed and it'll try to make a call instead of showing the dialog box informing the user he needs to log in, which is what we want