Adds tests for Zero Injection

Closes #2166.

Adds tests that tests date histogram aggregations are returned in the proper order.
Might be a little cleaner if you just iterate through the values instead of repeating the same line...

```
results.rows.forEach(function (row) {
	expect(_.isArray(row.series[0].values)).to.be(true);
});
```

Also, I think `console.log` is probably fine to keep in a test, but I'm just wondering if you left it in there on purpose or just cuz you were debugging with it in there.

Thoughts?