Make sure different recommenders have different namespaces by default.
Add Predictor.redis_prefix configuration option, which accepts a proc.
Allow per-class redis key prefixing, and make global API consistent with it.
Make sure people can use redis_prefix([nil]) to get the old behavior.
One more spec to make sure arrays work as redis prefixes.
Update readme and changelog for redis_prefix changes.
Add a spec to ensure that the redis_prefix [nil] workaround also works at the global level.
Merge pull request #16 from Pathgather/key-namespace-flexibility

Redis prefixing