Bq fake

[gfr10598]

This introduces a rudimentary bqiface fake, that can be used to do very basic tests against the bqiface API.

So far, it includes partial implementations of: Client, Dataset, Table, Query, Job, RowIterator

One can create, retrieve, and run queries against a Table, but the query result is always an empty iterator.

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This change is 

[coveralls]

Pull Request Test Coverage Report for Build 202

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 46.758%

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Totals
Change from base Build 182:	0.0%
Covered Lines:	137
Relevant Lines:	293

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💛 - Coveralls