repackaging: all the repackaging changes squashed

tools/npm/check-node-modules

@@ -4,7 +4,13 @@ var checkNpm = require('./check-node-modules.js');
 
 var purgeIfStale = (process.argv.indexOf('--purge') !== -1);
 
+if (process.env.TRAVIS && !purgeIfStale) {
+  process.exit(0);
+}
+
 // check-node-modules will exit(1) if we don't need to install to short-circuit `npm install`
 // see .travis.yml's `install` block to see the reason for this
-process.exit(checkNpm(true, purgeIfStale) ? 1 : 0);
+var nodeModulesOK = checkNpm(true, purgeIfStale);
+
+process.exit( nodeModulesOK || purgeIfStale ? 0 : 1);