Cleanup of piskel.js

Partial cleanup of piskel:
  new events and constant
  move palette and color picker in ToolSelector
  create Notifcation.js and move user message in it
  create LocalStorageService and move LS stuff in it

js/lib/pubsub.js

@@ -7,7 +7,7 @@
   var o = $({});
 
   $.subscribe = function() {
-    console.log("SUBSCRIBE: " + arguments[0]);
+    //console.log("SUBSCRIBE: " + arguments[0]);
     o.on.apply(o, arguments);
   };
 
@@ -16,7 +16,7 @@
   };
 
   $.publish = function() {
-    console.log("PUBLISH: " + arguments[0]);
+    //console.log("PUBLISH: " + arguments[0]);
     o.trigger.apply(o, arguments);
   };