Merge pull request redis#152 from go-redis/fix/appengine-unsafe

Don't use unsafe on appengine. Fixes redis#151.

Merge pull request redis#138 from go-redis/fix/unsafe-conv

Use unsafe for bytes->string conversion.

Merge pull request redis#137 from go-redis/fix/sorted-set-bytes

Add bytes support for sorted set.

Merge pull request redis#136 from go-redis/fix/select-db-nil-pool

Fix nil pool on read timeout. Fixes redis#135.

Merge pull request redis#133 from go-redis/feature/pubsub-api

pubsub: improve API and docs.

Merge pull request redis#127 from go-redis/fix/ring-keys-hashing

ring: fix key hashing in Ring pipeline.

Merge pull request redis#124 from go-redis/fix/ring-pool-timeout

ring: ignore pool timeout when pinging shards.

Merge pull request redis#123 from go-redis/fix/script-api-inconsistency

script: fix small API inconsistency (backwards compatible).

Add Ring example. Improve existing examples.

Merge pull request redis#120 from go-redis/feature/ring-pipeline

Add RingPipeline.