initial revision
localization
stop reading in onStop, not in onPause
new method in the API
more methods in API
API interface has been changed; API is now extendable
new method in API
interface Api has been intorduced
use book language; printStackTrace for exceptions
API synchronization
dont scroll last page
cleanup
use standard button icons
cleanups; title
better UI
API enhancements
current paragraph hightlighting; mix fixes
code simplification
API synchronization; error messages; code cleanup; version number => 1.0
more correct initialization: don't assume API is initalized before TTS