BigQuery

#### Docs: https://stephenplusplus.github.io/gcloud-node/#/docs/master/bigquery

##### Todo List (current):

- [x] Unit tests
- [x] Regression tests
- [x] Update use cases from the doc examples to less kitten-based use cases :smirk_cat: 
Fixed in 8772ea6560b9ae1749d65293bc1629849f958e55