small cleanup, no functionality change
Added a getPerson method to DBConnector that loads a person from the DB, given an ID.  Returns ResultSet
Added method in Student to load attributes from ResultSet
Added constructor for Student to load attributes from ResultSet
Added a print method to Student for testing.

Use new functionality like this:
ResultSet = DBConnector.getPerson(2);
Student.load(ResultSet);

or

Student student = new Student(DBConnector.getPerson(2);