Bring and require spin from spree_backend and respective progress indicator js and css

app/assets/javascripts/admin/all.js

@@ -29,6 +29,7 @@
 //= require spree
 //= require admin/spree_backend
 //= require modernizr
+//= require spin
 //= require css_browser_selector_dev
 //= require responsive-tables
 //= require admin/spree_paypal_express

app/assets/javascripts/admin/spree/progress.coffee

@@ -0,0 +1,27 @@
+$(document).ready ->
+  opts =
+    lines: 11
+    length: 2
+    width: 3
+    radius: 9
+    corners: 1
+    rotate: 0
+    color: '#fff'
+    speed: 0.8
+    trail: 48
+    shadow: false
+    hwaccel: true
+    className: 'spinner'
+    zIndex: 2e9
+    top: 'auto'
+    left: 'auto'
+
+  target = document.getElementById("spinner")  
+
+  $(document).ajaxStart ->
+    $("#progress").fadeIn()
+    spinner = new Spinner(opts).spin(target)    
+
+  $(document).ajaxStop ->
+    $("#progress").fadeOut()    
+