Added make docker to easy start docker container

Makefile

@@ -40,3 +40,6 @@ complexity:
 test:
 	go get golang.org/x/tools/cmd/cover
 	go test ./... -cover
+
+docker:
+	docker run --rm -it -v ${PWD}:/go/src/pages -w /go/src/pages golang:1.5 /bin/bash