Print dots while running tests

Travis thinks something is wrong when the script produces no output in
10 minutes, which leads to sporadic test failures like
https://travis-ci.org/buildout/buildout/jobs/39916822

Makefile

@@ -52,4 +52,4 @@ clean:
 	rm -rf $(BUILD_DIRS)
 
 test:
-	$(HERE)/bin/test -1
+	$(HERE)/bin/test -1 -v