Version 0.40:

New features:
- bulk compressing and piping is possible now
- added support for multitouch gestures when cropping the image

Bugfixes:
- fixed app icon resolution too low when displayed on the f-droid web page
- fixed app crash when rotating device with jpeg quality preview enabled
- removed (useless) check-button beside the image size
- fixed sharing not working when piping was aborted with the back-button
