Borrower class has insert methods for Borrower and BorrowerType
added delete methods (based on table PK) into Borrower
Merge pull request #2 from g2-aj/branch_alshahna

borrower info
Merge branch 'master' of https://github.com/g2-aj/cs304 into g3-ks-branch
Created book class. Created insert and delete functions for Book, BookCopy, HasAuthor, HasSubject