Init clutter gst every time just once
refs #990
Merge branch 'audio-gst' of github.com:BrainTech/pisak into audio-gst

Conflicts:
	pisak/media.py
Merge branch 'master' into audio-gst
Merge branch 'audio-gst'
Merge branch 'audio-gst'
Merge branch 'master' into clock

Conflicts:
	pisak/widgets.py
Added progress notifies for audio playback
refs #901
Clock converts passed value to int seconds
refs #901