refactored the listening view

the cassette reels are now controlled by objects defined in the nib.
also, the track label now gets its own class and controls for itself what it displays

Signed-off-by: Jake Bromberg <jake.bromberg@gmail.com>
addendum to previous commit

Signed-off-by: Jake Bromberg <jake.bromberg@gmail.com>
Merge branch 'master' of https://github.com/jakebromberg/wxyc-iphone-app