removed "virtual" from GetID() function.
Merge branch 'master' of https://github.com/captainMattador/BookStoreApp
Merge branch 'master' of https://github.com/captainMattador/BookStoreApp
Merge branch 'master' of https://github.com/captainMattador/BookStoreApp
Added cout statements to destructors for debugging.
Merge branch 'master' of https://github.com/captainMattador/BookStoreApp
Merge branch 'master' of https://github.com/captainMattador/BookStoreApp