Merge pull request #48 from g2-aj/branch_kris

added two buttons graphics ( no action on press as of yet, I am working on processReturn)
small ui change
Merge branch 'master' of https://github.com/g2-aj/cs304 into branch_alshahna
added gui for checking overdue items
fixed check overdue items and fixed clerk manu layout
Merge pull request #49 from g2-aj/branch_alshahna

Branch alshahna
Merge branch 'master' of https://github.com/g2-aj/cs304 into branch_kris