2.22.0

 * Create stack-removing errorhandler middleware (Richard Walker)
 * Update README.md (Rand McKinney)
 * Allow EJS templates to use includes (Samuel Gaus)
 * Fix options.to assertion message in user.verify (Farid Nouri Neshat)
 * Upgrade Travis to container-based infrastructure (Miroslav Bajtoš)
 * fix typo "PeristedModel" (Christoph)
