Redis adapter

[coveralls]

Pull Request Test Coverage Report for Build 3812950958

• 409 of 419 (97.61%) changed or added relevant lines in 9 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.7%) to 94.141%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
redis/transaction.go	78	79	98.73%
redis/settings.go	77	80	96.25%
redis/context.go	12	18	66.67%
<!--	Total:	409	419	97.61%	-->

Totals
Change from base Build 3686006844:	1.7%
Covered Lines:	1205
Relevant Lines:	1280

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💛 - Coveralls