Initial pass at prometheus support.

.gitignore

cmd/cashierd/main.go

server/auth/github/github.go

server/auth/gitlab/gitlab.go

server/auth/google/google.go

server/metrics/metrics.go

vendor/github.com/beorn7/perks/LICENSE

vendor/github.com/beorn7/perks/quantile/exampledata.txt

vendor/github.com/beorn7/perks/quantile/stream.go

.../github.com/matttproud/golang_protobuf_extensions/LICENSE

...r/github.com/matttproud/golang_protobuf_extensions/NOTICE

...com/matttproud/golang_protobuf_extensions/pbutil/Makefile

...om/matttproud/golang_protobuf_extensions/pbutil/decode.go

...b.com/matttproud/golang_protobuf_extensions/pbutil/doc.go

...om/matttproud/golang_protobuf_extensions/pbutil/encode.go

vendor/github.com/prometheus/client_golang/LICENSE

vendor/github.com/prometheus/client_golang/NOTICE

.../github.com/prometheus/client_golang/prometheus/README.md

...thub.com/prometheus/client_golang/prometheus/collector.go

...github.com/prometheus/client_golang/prometheus/counter.go