Add button to delete a spammer in the flag modal

Add SiteSettings: delete_user_max_age, delete_all_posts_max. Add delete spammer button to admin flags UI
Moderators can delete users too

app/assets/javascripts/admin/controllers/admin_flags_controller.js

@@ -56,6 +56,16 @@ Discourse.AdminFlagsController = Ember.ArrayController.extend({
     });
   },
 
+  /**
+    Deletes a user and all posts and topics created by that user.
+
+    @method deleteSpammer
+    @param {Discourse.FlaggedPost} item The post to delete
+  **/
+  deleteSpammer: function(item) {
+    item.get('user').deleteAsSpammer(function() { window.location.reload(); });
+  },
+
   /**
     Are we viewing the 'old' view?