Merge branch 'master' of https://github.com/grafana/loki into live-log-tailing-improvements

.circleci/config.yml

.golangci.yml

.gometalinter.json

Gopkg.lock

Makefile

cmd/logcli/query.go

cmd/promtail/main.go

cmd/promtail/promtail-docker-config.yaml

cmd/promtail/promtail-local-config.yaml

docs/promtail-setup.md

docs/troubleshooting.md

docs/usage.md

loki-build-image/Dockerfile

pkg/chunkenc/gzip.go

pkg/distributor/distributor.go

pkg/ingester/chunk_test.go

pkg/ingester/client/client.go

pkg/ingester/flush_test.go

pkg/ingester/ingester_test.go

pkg/ingester/instance.go