Make an iso image from a directory on OSX

This is a spanish translation from the next post below. You can read the post in spanish [here](https://misapuntesde.com/post.php?id=248&lang=es).

Link: [pcsplace.com > how-to-create-bootable-iso-image-on-mac-os-x](http://pcsplace.com/apple/how-to-create-bootable-iso-image-on-mac-os-x/)