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
Merge branch 'master' into clock
Merge branch 'clock' of github.com:BrainTech/pisak into clock

Conflicts:
	pisak/widgets.py
Added custom pisak timer
Pisak clock as the timer
refs #901
Added all missing icons to audio
Improved dimensioning of audio views
Fixed style of audio tiles and progress bar label
Improved scrolling of playlist and shape of its code inline comments
refs #1083
Merge branch 'clock' into flat-audio
Connected clock to audio
Set up clock style and alignment policy
Clock display in format hh:mm::ss
refs #1083