Add travis-ci config

.travis.yml

+language: go
+
+go:
+  - 1.7
+  - 1.8
+
+install:
+  - go build -i .
+
+script:
+  - make test vet
+
+cache:
+  directories:
+    - $GOPATH/src
+    - $GOPATH/pkg

Makefile

@@ -2,6 +2,10 @@ VERSION = dev-$(shell date +%FT%T%z)
 
 GO = go
 GO_FLAGS = -ldflags="-X main.version=$(VERSION)"
+GOFMT = gofmt
+
+# TODO: Simplify this once ./... ignores ./vendor
+GO_PACKAGES = ./cmd/... ./utils/...
 
 all: kubecfg
 
@@ -9,9 +13,16 @@ kubecfg:
 	$(GO) build $(GO_FLAGS) .
 
 test:
-	$(GO) test ./cmd/...
+	$(GO) test $(GO_PACKAGES)
+
+vet:
+	$(GO) vet $(GO_PACKAGES)
+
+fmt:
+	$(GOFMT) -s -w $(shell $(GO) list -f '{{.Dir}}' $(GO_PACKAGES))
 
 clean:
 	$(RM) ./kubecfg
 
-.PHONY: all test clean kubecfg
+.PHONY: all test clean vet fmt
+.PHONY: kubecfg