Added key.Prev command
Update CONTRIBUTING.md

link to Google's Go Style Guide
Merge pull request #189 from cockroachdb/bram/prev-key

Added key.Prev command
Fix range cache unittest by checking for KeyMax
Fix TODO
Merge pull request #193 from cockroachdb/spencerkimball/fix-cache-tests

Fix range cache unittest by checking for KeyMax
Utilize a sync.Pool for caching gzip writers
Merge pull request #194 from cockroachdb/spencerkimball/allocation-pools

Utilize a sync.Pool for caching gzip writers
Update raft submodule and start using the new raft.Storage interface.
Merge pull request #190 from bdarnell/multiraft-storage

Update raft submodule and start using the new raft.Storage interface.
Google renamed download directory for releases.

The releases now have a 'v' as part of the version number for the
directory name.
Merge pull request #199 from jamesgraves/protobuf_download_moved

Download directory name for protobuf releases.