Merge branch 'master' into microsoft

.gitignore

.travis.yml

Dockerfile

Makefile

README.md

client/client.go

cmd/cashier/main.go

cmd/cashierd/main.go

lib/proto.go

lib/version.go

server/a_server-packr.go

server/auth/github/github.go

server/auth/github/github_test.go

server/auth/gitlab/gitlab.go

server/auth/gitlab/gitlab_test.go

server/auth/google/google.go

server/auth/google/google_test.go

server/auth/microsoft/microsoft.go

server/auth/microsoft/microsoft_test.go

server/auth/provider.go