v1.3.7

Server Binaries

The trillian_log_server, trillian_log_signer and trillian_map_server
binaries have moved from github.com/google/trillian/server/ to
github.com/google/trillian/cmd. A subset of the server package has also
moved and has been split into cmd/internal/serverutil, quota/etcd and
quota/mysqlqm packages.