Refactor out ImageModelHelper from DBHelper
Refactor BookmarkModelHelper from DBHelper
Refactor UpdateInfoHelper from DBHelper
Refactor NovelContentModelHelper from DBHelper
Refactor BookModelHelper from DBHelper
Refactor NovelCollectionModelHelper from DBHelper
Remove duplicated codes in NovelCollectionModelHelper
Merge pull request #50 from freedomofkeima/master

Create an Alternative Language selection dialog