Add Items Transaction

Add Items transaction for managers complete
Merge pull request #16 from ellina-s/ellina

Ellina
changed to using arrayLists added sub transactions
Merge branch 'master' of https://github.com/ellina-s/cs304 into arjan
Merge pull request #17 from ellina-s/arjan

Merge
Added bill for Customer Sub Transaction
Removed class
Merge pull request #19 from ellina-s/arjan

Arjan
I think customer sub transactions are finished.
Renamed test set
Merge pull request #20 from ellina-s/arjan

Arjan
Finished the getPurchase method
commented out line
Merge pull request #21 from ellina-s/arjan

Arjan
Unfinished Process Order menu

Started on Process Order
Merge pull request #22 from ellina-s/clark

Clark
Implemented getLeadSinger 2D array
Implemented getting 2D array for HASSONG
Implemented Customer Registration and added test for it
Refactored Customer Registration and test for it