Enable 'go vet' on Travis

.travis.yml

@@ -4,7 +4,16 @@ go:
   - 1.3.3
   - 1.4
 
-script: go test -v . ./messaging ./influxql
+install:
+  - go get -d -v ./... && go build -v ./...
+  - if [ $TRAVIS_GO_VERSION == "go1.3.3" ]; then
+    go get -u code.google.com/p/go.tools/cmd/vet;
+    fi
+  - if [ $TRAVIS_GO_VERSION == "go1.4" ]; then
+    go get -u golang.org/x/tools/cmd/vet;
+    fi
+
+script: go test -v . ./messaging ./influxql; go vet ./...
 
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