Add Makefile for developer convenience.

Makefile

@@ -0,0 +1,35 @@
+PKG := inbucket
+SHELL := /bin/sh
+
+SRC := $(shell find . -type f -name '*.go' -not -path "./vendor/*")
+PKGS := $$(go list ./... | grep -v /vendor/)
+
+.PHONY: all build clean fmt install lint simplify test
+
+all: test lint build
+
+clean:
+	go clean
+
+deps:
+	go get -t ./...
+
+build: clean deps
+	go build
+
+install: build
+	go install
+
+test: clean deps
+	go test -race ./...
+
+fmt:
+	@gofmt -l -w $(SRC)
+
+simplify:
+	@gofmt -s -l -w $(SRC)
+
+lint:
+	@test -z "$(shell gofmt -l . | tee /dev/stderr)" || echo "[WARN] Fix formatting issues with 'make fmt'"
+	@golint -set_exit_status $${PKGS}
+	@go vet $${PKGS}