Revert "Merge pull request #72 from stan-dev/feature/add_command_test_to_unit_tests"

This reverts commit 2d0cafe9071b1704787717ac7f71ca5ef7a6583f, reversing
changes made to a0132a14c120266c6c2bc25c72242f44bb9951c2.
Merge pull request #79 from stan-dev/feature/revert_pull_request_72

Revert "Merge pull request #72 from stan-dev/feature/add_command_test_to...