Add Makefile to test and validate.

Signed-off-by: David Calavera <david.calavera@gmail.com>

.travis.yml

@@ -6,11 +6,5 @@
   go:
     - 1.5
     - tip
-  install:
-    - go get -t ./...
-    - go get github.com/golang/lint/golint
-  script:
-    - go vet ./...
-    - test -z "$(golint ./... | tee /dev/stderr)"
-    - test -z "$(gofmt -s -l . | tee /dev/stderr)"
-    - go test -tags=test -v ./...
+  install: make deps
+  script: make validate && make test

Makefile

@@ -0,0 +1,15 @@
+.PHONY: all deps test validate
+
+all: deps test validate
+
+deps:
+	go get -t ./...
+	go get github.com/golang/lint/golint
+
+test:
+	go test -tags=test ./...
+
+validate:
+	go vet ./...
+	test -z "$(golint ./... | tee /dev/stderr)"
+	test -z "$(gofmt -s -l . | tee /dev/stderr)"

README.md

@@ -55,9 +55,11 @@ This package is still pending to be extracted from the Docker engine.
 
 ## Developing
 
-engine-api requires some minimal libraries that you can download running `go get ./...`.
+engine-api requires some minimal libraries that you can download running `make deps`.
 
-To run tests, use this command `go test -tags=test ./...`. We use build tags to isolate functions and structures that are only available for testing.
+To run tests, use the command `make test`. We use build tags to isolate functions and structures that are only available for testing.
+
+To validate the sources, use the command `make validate`.
 
 ## License