[bug] Bug fixed #53 #52 #41

Removed dummy activity for fade in/out transition when language changing (if you want, create by yourself when onBeforeLocaleChanged(...) called)

API level 14 supported (#54)

Added example code for AndroidX Preferences

[bug] Bug fixed : Incorrect behavior in API level 24-27 (Android 7.0 …

…- 8.1) #30 #37

[bug] Bug fixed : setDefaultLanguage does not work properly #28
Migrate to AndroidX and latest Gradle
Migrate to Kotlin
Add UI automated test in example code
Move set default language to Application class (Please see the migrate instruction)
Add pre-implemented application class for LocalizationApplicationDelegate