time.js: relax relevancy a little.

"time austin" and "time san francisco" now work!

![screen shot 2014-12-02 at 3 31 26 pm](https://cloud.githubusercontent.com/assets/81969/5270347/548712a6-7a38-11e4-9afc-40f51c477f24.png)

Problem was that it was comparing:
```javascript
DDG.stringsRelevant("san francisco, california", "San Francisco United States")
```

So instead it compares:
```javascript
DDG.stringsRelevant("san francisco, california", "San Francisco")
```

Which works. Unfortunately, this is a deep trigger so it can't be tested on DuckPAN. CC @jdorweiler @MariagraziaAlastra @moollaza