uses lifo image loading.
threading playlist generator
Merge branch 'develop' of github.com:meiraka/music_controller into lazy_imaging
sleep -> sleep_time
add download queue.
extract db connection code
cleanup
refactoring
lazy background start
lazydict mixin
refactoring code
fix bugs: thread err, default dict err, dialog attr err
socket error
Merge pull request #4 from meiraka/lazy_imaging

Lazy imaging