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.

As far as it not being wrapped in a function? It doesn't need to be, as the call through to the BigQuery class will handle `new`-ing it if called improperly, and will handle its settings the same.