Removed unneeded imports.
Moved the onCreate(...) method for the onUpdate(...) method in the
SQLite helper within the try block to ensure the recreation of the
database occurs when the dropping of the database tables has occurred
without errors.
Refactoring configuration controller and associated classes that use the
configuration
Refactoring of Questions interface
Moved the save method for questions from the Round class to the Question
class to make the system more consistent with the OO style of
polymorphism.
Refactoring: added documentation to new classes.