Ensure store interface is implemented.
WIP
Require client during configuration.
Die hash rocket.
Tweaks
Initial pass on Redis backend.
Update cache.
Some tweaks
Specs green.
Fix coverage.
Enable redis-server on travis.
Travis changes.
add redis to rails 4 gemfile
Try an explicit matrix.
Allow some failures
Merge remote-tracking branch 'origin/master' into redis-backend

Conflicts:
	README.md
Merge pull request #38 from rpush/redis-backend

Redis backend