Block Properties Enhancements

[gcapnias]

I think I would be a nice idea to add an option on the block properties to be able to have a download link for the pdf file, just as the original file block.

I would also suggest having an option for the block to occupy the full width of the page – style=> width: 100% - instead of having certain pixels width.

Thanks,
George J.

[afragen]

I will happily review any PRs.