Revert "Moving iojs to allowed failure until https://github.com/npm/npm/issues/8406 gets patched"
Revert "Moving iojs to allowed failure until https://github.com/npm/npm/issues/8406 gets patched"

This reverts commit 9bef4910df67a9da29d5aac5c6e323bf5c4266aa.

Ensighten/grunt-spritesmith,Ensighten/grunt-spritesmith