Fix images parsing and add artist album to ChartEntry

[soubenz]

Billboard website use Javascript to lazy load images. This caused the issue with parsing the images. I managed to trace the data to an object in the page and create the links. I also added artist image next to the title/album image.

[guoguo12]

Thanks! Can you rebase your branch? I fixed the tests in master.

I'll leave some inline comments.

[soubenz]

@guoguo12 I did some modifications added more sizes for the images