fixed issue with older android versions not having compatible database, in Favorites Activity
refactored code so that Home Activity queries the contacts database and passes the needed information to child acitivities
Settings Activity now refactored to get data from Home Activity
removed now unnecessary DBHelper class
fixed intents for SettingsActivity when called from FavoritesAcitivity or MainActivity, removed some unnecessary includes
changed MainActivity to AllContactsActivity, since it's no longer the main activity