BigQuery

#### Docs: https://stephenplusplus.github.io/gcloud-node/#/docs/master/bigquery

##### Todo List (current):

- [x] Unit tests
- [x] Regression tests
- [ ] Update use cases from the doc examples to less kitten-based use cases :smirk_cat: 
I'm only checking a prop of an object here, so `typeof body.configuration.query.destination` would throw a ref error as well if body.configuration.query didn't exist. It doesn't matter.

* cool gif of something shrugging like "i ain't cur" goes here *