run gometalinter with go vet

.travis/script.sh

@@ -3,6 +3,12 @@
 set -ex
 
 go get -t ./...
+if [ ${TESTMODE} == "lint" ]; then 
+  go get github.com/alecthomas/gometalinter
+  gometalinter --install
+  gometalinter --tests ./...
+fi
+
 if [ ${TESTMODE} == "unit" ]; then
   ginkgo -r -v -cover -randomizeAllSpecs -randomizeSuites -trace -skipPackage integrationtests,benchmark
 fi