add analytics

Don't merge yet, I'm noticing an issue with angulartics where it's reporting the initial pageview twice.

---

### Fun way to reproduce

Replace GA code with:

```html
<script>
function ga() {
  console.log(arguments);
}
</script>
```

Reload the page and check your console:

```js
["send", "pageview", "/"]
["send", "pageview", "/"]
```

This appears to happen for every page, not just "/". The only case in which it's not happening is valid redirects we want to be reported like this:

```js
["send", "pageview", "/api/asdasd"]
["send", "pageview", "/doc/api"] 
```
---

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.