refactor, replace i18n by python gettext module not wxPython (because Python got complete document)
add i18n sample image
remove redundant file
refactor, move puzzle loader to a function not initialize in app module
fallback PyInstaller from 2.1 to 1.5.1, for avoid the issue "launch package will fail at path contain unicode"
refactor, use relpath() to find PuzzleDB not hard code the path