* thumbnail aspect ratio sizing tweaks
* show approximate values for formatted bytes
* truncate titles over 80 characters in the file item list component
* display notifications on Android 8.0 Oreo and higher using required notification channels
* fix daemon background service implementation for Android Oreo
* created react base and updated build to use android sdk 23
* add nodejs install step to travis build script
* added simple build script to create the react native bundle before the buildozer APK build