travis: use latest go tool repo

.travis.yml

@@ -4,8 +4,8 @@ go:
   - 1.4
 
 install:
- - go get code.google.com/p/go.tools/cmd/cover
- - go get code.google.com/p/go.tools/cmd/vet
+ - go get golang.org/x/tools/cmd/cover
+ - go get golang.org/x/tools/cmd/vet
 
 script:
  - INTEGRATION=y ./test