Ignore golint errors that can't be fixed

Stop duplicating checkers in .travis.yml - use Makefile as definitive source

.travis.yml

@@ -15,12 +15,11 @@ go:
 
 install:
  - go get ./...
- - go get -u github.com/golang/lint/golint
+ - go get -u github.com/kisielk/errcheck
  - go get -u golang.org/x/tools/cmd/goimports
+ - go get -u github.com/golang/lint/golint
 
 script:
-  - go vet ./...
-  - diff <(goimports -d .) <(printf "")
-  - diff <(golint ./...) <(printf "")
+  - make check
   - go test -v ./...
   - go test -cpu=2 -race -v ./...

Makefile

@@ -14,8 +14,8 @@ test:	rclone
 check:	rclone
 	go vet ./...
 	errcheck ./...
-	golint ./...
-	diff <(goimports -d .) <(printf "")
+	goimports -d . | grep . ; test $$? -eq 1
+	golint ./... | grep -E -v '(StorageUrl|CdnUrl)' ; test $$? -eq 1
 
 doc:	rclone.1 MANUAL.html MANUAL.txt