version 1.4.1

Changelog:
- More QtMultimedia compatible QML playback API
- Debian package support. Now you can build on
ubuntu>=14.04 using debuild
- Subtitle: libass renderering support. Dynamically change
FFmpeg parser and libass
- Log level control support without changing any Qt logging
functions (qDebug, qWarning etc.)
- Video orientation support in renderers
- Bug fix: video frame with alpha value. video stream start
time >0. OpenAL can not close correctly...
- QML only: video preview.
- players: config UI in QMLPlayer. Video preview on
progress bar.