Update Makefile; remove cruft

 Fixes #25

Makefile

@@ -1,52 +1,21 @@
-TEST?=$$(go list ./... |grep -v 'vendor')
-WEBSITE_REPO=github.com/hashicorp/terraform-website
-PKG_NAME=librato
-plugin_name=terraform-provider-appoptics
-plugin_path=~/.terraform.d/plugins
+.PHONY: build test testacc vet lint release
 
+plugin_name=terraform-provider-appoptics
 
 default: build
 
 build:
 	go build -o $(plugin_name)
 
-user-install:
-	mkdir -p $(plugin_path) && go build -o $(plugin_path)/$(plugin_name)
+test:
+	go test ./...
 
-test: fmtcheck
-	go test -i $(TEST) || exit 1
-	echo $(TEST) | \
-		xargs -t -n4 go test $(TESTARGS) -timeout=30s -parallel=4
-
-testacc: fmtcheck
-	TF_ACC=1 go test $(TEST) -v $(TESTARGS) -timeout 120m
+testacc:
+	TF_ACC=1 go test -v -timeout 120m
 
 vet:
-	@echo "go vet ."
-	@go vet $$(go list ./... | grep -v vendor/) ; if [ $$? -eq 1 ]; then \
-		echo ""; \
-		echo "Vet found suspicious constructs. Please check the reported constructs"; \
-		echo "and fix them if necessary before submitting the code for review."; \
-		exit 1; \
-	fi
-
-fmtcheck:
-	@sh -c "'$(CURDIR)/scripts/gofmtcheck.sh'"
-
-errcheck:
-	@sh -c "'$(CURDIR)/scripts/errcheck.sh'"
-
-vendor-status:
-	@govendor status
-
-test-compile:
-	@if [ "$(TEST)" = "./..." ]; then \
-		echo "ERROR: Set TEST to a specific package. For example,"; \
-		echo "  make test-compile TEST=./$(PKG_NAME)"; \
-		exit 1; \
-	fi
-	go test -c $(TEST) $(TESTARGS)
-
+	go vet ./...
 
-.PHONY: build test testacc vet fmt fmtcheck errcheck vendor-status test-compile website website-test
+lint:
+	"$$(go env GOPATH)/bin/golangci-lint" run