Merge remote-tracking branch 'upstream/master' into microsoft

.travis.yml

README.md

server/signer/signer_test.go

server/store/a_store-packr.go

server/store/migrations/migrations_test.go

...store/migrations/mysql/20180807224200_new_primary_key.sql

...ore/migrations/sqlite3/20180807224200_new_primary_key.sql

server/store/sqldb.go

server/store/store.go

server/store/string_slice.go

server/web.go

vendor/github.com/stretchr/testify/require/doc.go

...thub.com/stretchr/testify/require/forward_requirements.go

vendor/github.com/stretchr/testify/require/require.go

vendor/github.com/stretchr/testify/require/require.go.tmpl

...or/github.com/stretchr/testify/require/require_forward.go

...thub.com/stretchr/testify/require/require_forward.go.tmpl

vendor/github.com/stretchr/testify/require/requirements.go

vendor/vendor.json