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.

Check if this helps anything: https://github.com/stephenplusplus/gcloud-node/commit/62b2135801031ecfa90fed8f43aac0fc6ec11b22