Add increment and decrement functionality to left resource

app/assets/javascripts/application.js

@@ -57,3 +57,5 @@ $(document).ready(function() {
         delegateSelector: 'a.smoothscroll'
     });
 });
+
+UnobtrusiveFlash.flashOptions['timeout'] = 3000;

app/assets/stylesheets/osem.css.scss

@@ -94,3 +94,8 @@ p.comment-body {
 .box{
   height: 230px;
 }
+
+.quantity_left{
+  height: 3em;
+  width: 9em;
+}