Added several methods to the BigQuery client for managing datasets:
get_datasets
get_dataset
create_dataset
delete_dataset
update_dataset
patch_dataset

And a helper fn that calculates a schema given a record:
schema_from_record
Format code to comply with PEP8

Also add/improve some docstrings.
Merge branch 'master' of https://github.com/tylertreat/BigQuery-Python into schema
Merge pull request #14 from aneilbaboo/master

Added several methods to the BigQuery client for managing datasets and generating schema