Accounts use enum types

Edited classes to use enumerated account types (e.g. INSTRUCTOR,
ASSISTANTADMIN) instead of ints.
Account access gets account type as int

Changed getAccountType function used in account access to
getAccountTypeAsInt to match changes made in Account.
Merge pull request #153 from graemesmth/master

Accounts use enum types
Merge pull request #154 from firethanatos/master

added addRubricItem to Rubric