chore(version-info): silence the HTTP curl to get the cdn version

Author: petebacondarwin

lib/versions/version-info.js

@@ -136,7 +136,7 @@ var getCdnVersion = function() {
         // as version-infos returns its result synchronously...
         var cdnResult = shell.exec('curl http://ajax.googleapis.com/ajax/libs/angularjs/' + version + '/angular.min.js ' +
                   '--head --write-out "%{http_code}" -o /dev/null -silent',
-                                    {silent: false});
+                                    {silent: true});
         if (cdnResult.code === 0) {
           var statusCode = cdnResult.output.trim();
           if (statusCode === '200') {