Cell now downloads the artwork when the information is displayed
Added check so we don't try to populate a cell with invalid data
Set a specific downloading image for the title while we download the title thumbnail (animated) and forced the default image back when reloaded
We now cache a poster image if we have to download it, if it's there we use the cached version
Checked the status of a request result as well as the data
Merge branch 'feature/artwork_download'