add node modules to repo

node_modules/tmp/test/keep-sync.js

@@ -0,0 +1,12 @@
+var spawn = require('./spawn-sync');
+
+var keep = spawn.arg;
+
+try {
+  var result = spawn.tmpFunction({ keep: keep });
+  spawn.out(result.name, spawn.exit);
+}
+catch (e) {
+  spawn.err(err, spawn.exit);
+}
+