Update for recent TravisCI changes.

Also, override the struct tag checking which is broken in the latest go
vet.

.travis.yml

@@ -1,11 +1,11 @@
 language: go
 go:
-  - go1.3
-  - release
+  - 1.3.3
+  - 1.4.1
 sudo: false
 before_install:
   - gotools=golang.org/x/tools
-  - if [ "$TRAVIS_GO_VERSION" = "release" ] || [ "$TRAVIS_GO_VERSION" = "go1.3.3" ]; then gotools=code.google.com/p/go.tools; fi
+  - if [ "$TRAVIS_GO_VERSION" = "go1.3.3" ]; then gotools=code.google.com/p/go.tools; fi
 install:
   - go get -d -t -v ./...
   - go get -v $gotools/cmd/cover

goclean.sh

@@ -13,7 +13,7 @@ set -e
 test -z $(gofmt -l -w . | tee /dev/stderr)
 test -z $(goimports -l -w . | tee /dev/stderr)
 test -z $(golint ./... | grep -v "ALL_CAPS" | grep -v "OP_" | tee /dev/stderr)
-go vet ./...
+go tool vet -structtags=false .
 env GORACE="halt_on_error=1" go test -v -race ./...
 
 # Run test coverage on each subdirectories and merge the coverage profile.