Added psychopy event handling
Merge branch 'test'

Conflicts:
	media_player_gst.py
Improvements improvements
Fixed pygame playback issues
Better structure of classes
Improved class abstractions

Almost got expyriment backend to work
Corrected localization of gst plugins in win

python modules can now stay in gstreamer framework and do not need to be
copied to the site-packages folder
Playback works in all backends!

- Playback now also works in Expyriment backend.
- Restructuring; further improved reduction in code redundancy
- Added feature to loop playback