Added BugHerd script for new landing page (staging only).

app/views/layouts/landing_page.html.haml

@@ -8,6 +8,15 @@
     = favicon_link_tag "favicon.ico"
     = stylesheet_link_tag "search/all"
     = javascript_include_tag "search/all"
+    - if Rails.env.staging?
+      :javascript
+        (function (d, t) {
+          var bh = d.createElement(t), s = d.getElementsByTagName(t)[0];
+          bh.type = 'text/javascript';
+          bh.src = '//www.bugherd.com/sidebarv2.js?apikey=4ftxjbgwx7y6ssykayr04w';
+          s.parentNode.insertBefore(bh, s);
+        })(document, 'script');
+
     = csrf_meta_tags
   %body.off-canvas
     = render "layouts/become_distributor"