E.g: Next Feature

Hi there

The following items feature development:

1. Cache can be generated in Playlist and Artist and Album.
2. Cache can be delete in Playlist and Artist and Album.
3. Show only those with Cache(For offline use)
4. Change the file Cache (alternative download)
5. Delete the cache automatically counts up the Plays. However, recent registration date and time to be excluded

Therefore need to be implement:
Change Database -
* Flags of the existence of Cached
* Field of Plays
Control mechanism of the download process -