Release to cran

[maurolepore]

Thanks @gonzalezeb for being on top of this package!

To help you leave it in a good state before we move our focus elsewhere, I'll try address as many of the open issues over the next couple of days. I would like to leave no obvious broken window before we submit to CRAN, I think could be in about 1 week from now -- if we keep momentum.

I'll assume this is okay with you but please do discuss here if you have questions, comments, or concerns.