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.