Bug 1038080 - [tarako]Cache only partial amounts of album photos in the ...

...music list to save the memory in music player.
This should re-render all the tiles in TilesView and the users will probably notice it(I guess it takes some time to finish), but I think it should be acceptable since it's a trade-off to gain more memory for the inproc music, we should also let product manager and our partner to know this.