Fix 'expected object implementing Phalcon\Mvc\View\EngineInterface' bug in the tests
Make sure unit-tests/engines always exists
(cherry picked from commit c8c7476ee44a3f039678fc1b47579e00c810ca89)
Merge pull request #1334 from sjinks/view-engines

Fix 'expected object implementing Phalcon\Mvc\View\EngineInterface' bug in the tests