BigQuery is a managed database-like service.  It supports SQL as
a query language and nearly infinite scale.  This PR adds support
to manage tables and datasets.

first cut, need to finish tests

fully functional and the tests are looking good.

this is a really thin wrapper around the create/delete portion of
the API

removed optional parameters, there is no update defined

add docs for bigquery resources

I'm going to remove all but the top level of fields and add a json
file config option as well.  but I wanted to save this incase I
want it arbitarily in the future

the table schema is an arbitrarily deep structure which I'm not
sure how to represent in terraform's schema syntax.  failing that
I have introduced a work around:
- one level deep of table structure in the standard terraform
schema manner (as many fields as you want, no sub fields or fields
of type 'record')
- arbitrary depth but specify a file that has the layout in json

I really like the idea of including an auxilarly file to represent
the table structure but I'm open to it being spcified via the file
built-in or something.  I don't really want to let there be
arbitrary depth configs in the terraform config file.  that seems
a bit heinous

saving because HDD is wonky.  will squash later

now to add some tests for the new schema nonsense

adds a test for the inline table format (one level) and the json
file format (arbitrary depth)