Jukefox alpha

This is the alpha version of jukefox. It will be provided with the newest features, before they go into the main version of jukefox. jukefox is a music player for large collections (>20 albums). It knows about music similarity, and allows new ways to interact with your music collection. Jukefox provides a rich set of functions, including:
* map of your albums in 2D and 3D
* smart shuffling mode that automatically detects your mood
* auto generated tag clouds to select precisely the style of music you want to hear
* automatically downloads album covers
* gapless playback
* scrobbles to last.fm
* shake skip

Please provide us with feedback, so that we can fix bugs of the alpha version.