Remove nanobox from nanobox vendor
Remove nanobox from nanobox vendor

Not sure how or why this made it into the vendoring, but I believe it
needs to go.

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