Fixed deformation of getting started popovers

app/assets/javascripts/app/views/publisher/getting_started_view.js

@@ -21,21 +21,24 @@ app.views.PublisherGettingStarted = Backbone.View.extend({
       offset: 30,
       id: 'first_message_explain',
       placement: 'right',
-      html: true
+      html: true,
+      container: 'body'
     }, 600);
     this._addPopover(this.el_visibility, {
       trigger: 'manual',
       offset: 10,
       id: 'message_visibility_explain',
       placement: 'bottom',
-      html: true
+      html: true,
+      container: 'body'
     }, 1000);
     this._addPopover(this.el_stream, {
       trigger: 'manual',
       offset: -5,
       id: 'stream_explain',
       placement: 'left',
-      html: true
+      html: true,
+      container: 'body'
     }, 1400);
 
     // hide some popovers when a post is created