Add RedshiftAdapter#496

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gronpipmaster wants to merge 4 commits intojpfuentes2:masterfrom

gronpipmaster:redshift-adapter

Commits on Feb 19, 2015

add RedshiftAdapter
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Commits on Feb 24, 2015

bug fixed check collumn pk
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RedshiftAdapter extends PgsqlAdapter, replace all space to tabs, and remove extra methods from RedshiftAdapter
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Commits on Mar 2, 2015

revert !(->conn instanceof PgsqlAdapter || ->conn instanceof RedshiftAdapter) -> !(->conn instanceof PgsqlAdapter)
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