BigQuery

## wip.

#### Docs: https://stephenplusplus.github.io/gcloud-node/#/docs/master/bigquery

Carrying on from #262. Just opening this so anyone interested can follow along.

I see what you're saying, but I think the note should draw attention to the fact that there are better error handling recourses available. If I added in something like `if (retries++ < 3) { /*try insert again */ }`, I think it would actually look more like that's what we're recommending as far as error handling.

Should I just ditch the `Retry the insert:` and `table.insert()` lines, and leave a note about error handling?