Category should be represented with Category object instead of String
Renamed QuestionActivity to QuizActivity
Moved all activities and fragments to common pl.jahu.quizzy.ui package
Introduced DataProvider interface with SampleDataProvider implementation
Added empty SetupActivity containing empty SetupFragment
Modified SampleDataProvider so it keeps map of all questions grouped by categories
Categories represented as strings instead of separate Category entity
Replaced DataProvder and SampleDataProvider with SQLite's QuizzyDatabase and QuizzyTestDatabase
Introduced Dagger to inject QuizzyDatabase to all activities
Set SetupActivity as a main activity
Fixes in database helper
Added list of categories and start button to SetupFragment
Made each category row clickable in order to check/uncheck it