[audio player] fixes related to CJAudioPlayer changes
[audio store] added empty cache methods
[album track listing tvc] use label container view in table header
[artwork store] moved blur/resize image logic to artwork store
[artwork store] use UIScreen scale to determine proper image size
[artwork store] major refactoring
[album track listing vc] factored out table view logic to it's own class
[artwork store] prevent attaching images to image views that have been reused
[audio player vc] updated delegate method