Added build date to footer

UI/Shared/Footer/Model.js

@@ -3,7 +3,16 @@ define(['app'], function () {
 
     NzbDrone.Shared.Footer.Model = Backbone.Model.extend({
         defaults: {
-            'version' : '0.0.0.0'
+            'version'   : '0.0.0.0',
+            'buildDate' : Date.create()
+        },
+
+        mutators: {
+            humanizedBuildDate: function () {
+                var date = Date.create(this.get('buildDate'));
+
+                return date.short();
+            }
         }
     });