you can now play with number of items to add

front-ui/app/constants/cartConstants.js

@@ -0,0 +1,10 @@
+var keyMirror = require('react/lib/keyMirror');
+
+// Define action constants
+module.exports = keyMirror({
+  LOAD: null,
+  ADD_ITEM: null, 
+  // because removeItem can be used to completely remove item
+  // and not just decrease count by 1
+  TAKE_ITEM_OUT: null 
+});