Merge branch 'master' into microsoft

Makefile

README.md

client/client.go

client/client_test.go

client/config.go

client/keys.go

cmd/cashier/main.go

example-server.conf

proto/signer.pb.go

proto/signer.proto

server/config/config.go

server/rpc.go

server/server.go

server/signer/signer.go

server/web.go

vendor/github.com/golang/protobuf/proto/encode.go

vendor/github.com/golang/protobuf/proto/lib.go

vendor/github.com/golang/protobuf/proto/properties.go

vendor/github.com/golang/protobuf/proto/table_marshal.go

vendor/github.com/golang/protobuf/proto/table_unmarshal.go