Add Student Login Unfinished, two tests in StudentTest, and password attribute with getters and setters in student entity
Made Polymorphic Authenticators for Student and Admin (there is no Instructor entity yet).
add instructor entity, add instructorTest, add getKey tests
Add InstructorAuthenticator, InstructorHomepageServlet, InstructorLoginServlet, instructorlogin.jsp, and InstructorServlet
Added InstructorsServlet, InstructorFinder, ListInstructorsRequest, ListInstructorsResponse, InstructorsServlet, instructors.jsp, CreateInstructorformServlet, create_instructor_form.jsp, and modified web.xml to map all servlets
Add CreateInstructorRequest, CreateInstructorResponse and InstructorCreator. All logins and creations of entities are fully functional