tests: removed @author
composer.json: in conflict with nette/nette < 2.2
marked @internal clases
Revert "Framework throws only Nette\* exceptions" (BC break)

This reverts commit e3966cc5775b8f968db28c40ebad0527c61ebde6.
removed dependency on Nette\Utils\DateTime
removed dependency on Nette\Object (BC break)
removed dependency on nette/utils