Fail gracefully if Redis version is too low #707
Fix required version
Merge branch 'master' into redis-too-low
Only exit if we were able to detect redis' current version
Add tests for redis too old, move to proxied_connection #707
Use the <=> operator
Merge pull request #736 from flapjack/redis-too-low

Fail gracefully if Redis version is too low, fixes #707