Issue-1: Old ActionBar is persisting across Activity destroys [1/1]

[Problem]
By hitting "back", the activity is destroyed, but not the process. A new ActionBar is created when the activity is
reopened, but the TutorActionBar still exists so the old one is being used.

[Solution]
Instead of it being a singleton, the TutorActionBar is a factory.
Use DB to store students [1/1]

[Problem]
The list of students was being stored statically instead of in the DB.

[Solution]
Use the DB to store students and read from the DB to get the list of students.
Add debug option to add debug students.