Add dual id for .com and .dev.

Author: jdalton

_config.yml

@@ -88,7 +88,10 @@ carbon_ads:
 
 google_analytics:
   href: https://www.google-analytics.com/analytics.js
-  commands: [['create', 'UA-6065217-64', 'auto'], ['require', 'linkid'], ['send', 'pageview']]
+  commands: [['create', 'UA-ACCOUNT-ID', 'auto'], ['require', 'linkid'], ['send', 'pageview']]
+  accounts:
+    lodash.com: 'UA-6065217-64'
+    lodash.dev: 'UA-134340230-1'
 
 exclude:
   - node_modules

assets/js/boot.js

@@ -49,9 +49,14 @@
   }
   // Initialize Google Analytics.
   if (navigator.onLine) {
+    var accounts = {{ site.google_analytics.accounts | jsonify }}
+    var commands = {{ site.google_analytics.commands | jsonify }}
+
+    commands[0][1] = accounts[location.hostname]
+
     root[root.GoogleAnalyticsObject = '_ga'] = {
       'l': Date.now(),
-      'q': {{ site.google_analytics.commands | jsonify }}
+      'q': commands
     }
     var script = document.createElement('script')
     script.src = '{{ site.google_analytics.href }}'