[BEAM-48] Implement BigQueryIO.Read as Source#190

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peihe wants to merge 5 commits intoapache:masterfrom

peihe:custom-bigquery-source

Commits on May 6, 2016

Implement BigQueryIO.Read as Soure
peihe
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Commits on May 9, 2016

fixup: addresssed feedback
peihe
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Commits on May 10, 2016

fixup: remove temp table and dataset
peihe
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Commits on May 12, 2016