Disable the collection of metrics when not deployed

We were using up a lot of events in our dev environments.

(imported from commit 8413ecfa835cce0a231bdf437f37ad8cf12a9133)

templates/zephyr/base.html

@@ -22,7 +22,10 @@
 (function(e,b){if(!b.__SV){var a,f,i,g;window.mixpanel=b;a=e.createElement("script");a.type="text/javascript";a.async=!0;a.src=("https:"===e.location.protocol?"https:":"http:")+'//cdn.mxpnl.com/libs/mixpanel-2.2.min.js';f=e.getElementsByTagName("script")[0];f.parentNode.insertBefore(a,f);b._i=[];b.init=function(a,e,d){function f(b,h){var a=h.split(".");2==a.length&&(b=b[a[0]],h=a[1]);b[h]=function(){b.push([h].concat(Array.prototype.slice.call(arguments,0)))}}var c=b;"undefined"!==
 typeof d?c=b[d]=[]:d="mixpanel";c.people=c.people||[];c.toString=function(b){var a="mixpanel";"mixpanel"!==d&&(a+="."+d);b||(a+=" (stub)");return a};c.people.toString=function(){return c.toString(1)+".people (stub)"};i="disable track track_pageview track_links track_forms register register_once alias unregister identify name_tag set_config people.set people.set_once people.increment people.append people.track_charge people.clear_charges people.delete_user".split(" ");for(g=0;g<i.length;g++)f(c,i[g]);
 b._i.push([a,e,d])};b.__SV=1.2}})(document,window.mixpanel||[]);
-mixpanel.init("{{ mixpanel_token }}");
+
+{# You can add {verbose: true} to the second argument of          #}
+{# mixpanel.init to get additional debugging information from it. #}
+mixpanel.init("{{ mixpanel_token }}", {track_pageview: {{ enable_metrics }}});
     </script>
 
     {# We need to import jQuery before Bootstrap #}
@@ -34,6 +37,9 @@ mixpanel.init("{{ mixpanel_token }}");
     var page_params = {debug_mode: false};
     </script>
     {% endblock %}
+    <script type="text/javascript">
+    page_params.enable_metrics = {{ enable_metrics }};
+    </script>
     {% compressed_js  'common' %}
     {% block customhead %}
     {% endblock %}

zephyr/context_processors.py

@@ -11,4 +11,5 @@ def add_settings(request):
 def add_metrics(request):
     return {
         'mixpanel_token': settings.MIXPANEL_TOKEN,
+        'enable_metrics': simplejson.dumps(settings.DEPLOYED),
     }

zephyr/static/js/metrics.js

@@ -3,7 +3,7 @@ var metrics = (function () {
 var exports = {};
 
 function enable_metrics() {
-    return page_params.domain === "humbughq.com";
+    return page_params.enable_metrics && page_params.domain === "humbughq.com";
 }
 
 if (! enable_metrics()) {