associate KeepScore with xml.gz files
add "Share" feature to share XML backup files
fix problem where the dialog would be shown too often
rename all string constants with prefix CONSTANT_ so I can use the Android localization helper to find missing translations
rename all string constants with prefix CONSTANT_ so I can use the Android localization helper to find missing translations, part 2
i18n for French and Japanese
allow user to share any number of selected games, redesign select all/deselect all/delete/share buttons in MainActivity