Breaking change, no longer calls redisio

This cookbook no longer calls the redisio::enable or
redisio::default recipes directly, but provides wrappers like
redis-multi::enable and redis-multi::default instead. You must now call them
separately. This allows downstream users to set `node['redisio']` directly
after taking advantage of redis-multi.`
Merge pull request #2 from martinb3/master

Breaking change, no longer calls redisio