DatasetInfo, DatasetId, TableId and Acl models and tests#417

Merged

aozarov merged 4 commits intogoogleapis:bigqueryfrom

mziccard:bigquery

Nov 29, 2015

Commits on Nov 24, 2015

Add DatasetInfo, DatasetId, TableId and Acl models and tests
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committed

Commits on Nov 26, 2015

Commits on Nov 27, 2015

Handle null role in Acl.fromPb, add test
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committed