add analytics

Don't merge yet, I'm noticing an issue with angulartics where it's reporting the initial pageview twice.

---


Replace GA code with:

```html
<script>
function ga() {
  console.log(arguments);
}
</script>
```

Reload the page:

```js
["send", "pageview", "/"]
["send", "pageview", "/"]
```

---

This appears to be related to luisfarzati/angulartics#86 or luisfarzati/angulartics#97. The issues are closed and we're using the latest release (0.15.19), but I'm still seeing this happen locally.

We shouldn't deploy this to production yet as we'll be double reporting every first pageview.