change zone.js version to 0.6.13 so that tests can run
change zone.js version to 0.6.13 so that tests can run

larsnolden/MLB,larsnolden/MLB,larsnolden/MLB,JohnnyQQQQ/angular-seed-material2,JohnnyQQQQ/angular-seed-material2,JohnnyQQQQ/md-dashboard,JohnnyQQQQ/angular-seed-material2,JohnnyQQQQ/md-dashboard,JohnnyQQQQ/md-dashboard