Revert "Added support for 'copyClasses' option."

This reverts commit 73173fda84600d0681586e4dddd0f98e8c4d7ffc.
Revert "Revert "Added support for 'copyClasses' option.""

This reverts commit eceba7ec6fc21da460b4cab2eef87ba1b4abcd95.
Revert "Revert "Revert "Added support for 'copyClasses' option."""

This reverts commit 4d7a6de4c702157656b2dfc0164530823de883f6.
Revert "Revert "Added support for 'copyClasses' option.""

This reverts commit eceba7ec6fc21da460b4cab2eef87ba1b4abcd95.