Adds md5 check to downloaded update to make sure the download is what it is supposed to be. Also fixes type in error message.
Adds md5 check to downloaded update to make sure the download is what it is supposed to be. Also fixes type in error message.

Signed-off-by: Ken Swenson <b9c7b42de27fde88448357eef801bbafbf848468@imo.uto.moe>

pagodabox/nanobox-cli,nanobox-io/nanobox,nanobox-io/nanobox,pagodabox/nanobox-cli,nanobox-io/nanobox-cli,nanobox-io/nanobox-cli,nanobox-io/nanobox-cli