Add a make command with CGO disabled

closes influxdata#458

Makefile

@@ -23,12 +23,29 @@ build-windows:
 		"-X main.Version=$(VERSION)" \
 		./cmd/telegraf/telegraf.go
 
+build-for-docker:
+	CGO_ENABLED=0 GOOS=linux go build -o telegraf -ldflags \
+					"-X main.Version=$(VERSION)" \
+					./cmd/telegraf/telegraf.go
+
 # Build with race detector
 dev: prepare
 	go build -race -o telegraf -ldflags \
 		"-X main.Version=$(VERSION)" \
 		./cmd/telegraf/telegraf.go
 
+# Build linux 64-bit, 32-bit and arm architectures
+build-linux-bins: prepare
+	GOARCH=amd64 GOOS=linux go build -o telegraf_linux_amd64 \
+								-ldflags "-X main.Version=$(VERSION)" \
+								./cmd/telegraf/telegraf.go
+	GOARCH=386 GOOS=linux go build -o telegraf_linux_386 \
+								-ldflags "-X main.Version=$(VERSION)" \
+								./cmd/telegraf/telegraf.go
+	GOARCH=arm GOOS=linux go build -o telegraf_linux_arm \
+								-ldflags "-X main.Version=$(VERSION)" \
+								./cmd/telegraf/telegraf.go
+
 # Get dependencies and use gdm to checkout changesets
 prepare:
 	go get github.com/sparrc/gdm