Enable the race detector for TravisCI.

goclean.sh

@@ -13,12 +13,13 @@ test -z "$(gofmt -l -w .     | tee /dev/stderr)"
 test -z "$(goimports -l -w . | tee /dev/stderr)"
 test -z "$(golint .          | tee /dev/stderr)"
 go vet ./...
+env GORACE="halt_on_error=1" go test -v -race ./...
 
 # Run test coverage on each subdirectories and merge the coverage profile.
 
 echo "mode: count" > profile.cov
 
-# Standard go tooling behavior is to ignore dirs with leading underscors
+# Standard go tooling behavior is to ignore dirs with leading underscores.
 for dir in $(find . -maxdepth 10 -not -path './.git*' -not -path '*/_*' -type d);
 do
 if ls $dir/*.go &> /dev/null; then