[pg_trgm] Per-query set_limit()

Hey!

I'd like to call `set_limit` on a per-query basis, i.e. searching for
restaurants in a given city should use 0.4 and searching for cinemas by
name should use 0.2. I can accomplish this with:

```
SELECT set_limit(0.2);
SELECT * FROM cinemas WHERE name % ?;
```

(similarly for restaurants).

My question is: is there a better way?

Best regards
--
Greg Navis
I help tech companies to scale Heroku-hosted Rails apps.
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