update PGResult and create PGRow class in the PostgreSQL library, plus quickstart#7

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taplin wants to merge 11 commits intoPerfectlySoft:masterfrom taplin:master

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Commits on Aug 7, 2016

Merge pull request #1 from PerfectlySoft/master
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Commits on Aug 9, 2016

Merge pull request #2 from PerfectlySoft/master
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provide PGResultSet and PGRow classes for row based access to query results and iterable behavior.
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Commits on Aug 28, 2016

Merge pull request #3 from PerfectlySoft/master
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Commits on Aug 29, 2016