[MOD-2242] Ti.Facebook: Support loginBehavior setting

   var win = Ti.UI.createWindow({
     backgroundColor : "#fff"
   }); 
   var btn = Ti.UI.createButton({
     title : "Login with Facebook"
   });
   var fb = require('facebook');
   fb.initialize();
   
   fb.addEventListener("login", function(e) {
       Ti.API.warn(e);
       if(e.success == false || e.cancelled) {
           return;
       }
       alert("loggedin");
   })
   
   btn.addEventListener("click", function() {    
       fb.permissions = ['email'];
       fb.authorize();
   });
   
   win.add(btn);
   win.open();