single method for updating cart item state / fixed problems with sinatra contrib

front-ui/app/constants/cartConstants.js

@@ -4,7 +4,7 @@ var keyMirror = require('react/lib/keyMirror');
 module.exports = keyMirror({
   LOAD: null,
   ADD_ITEM: null, 
-  // because removeItem can be used to completely remove item
+  // because REMOVE_ITEM could be used to completely remove item
   // and not just decrease count by 1
   TAKE_ITEM_OUT: null 
 });