Implemented @pesho's proposed changes.
Implemented @pesho's proposed changes.

bnadim/docker-iojs,pesho/docker-iojs,jbhannah/docker-iojs,yyolk/docker-iojs-graphicsmagick,cgvarela/docker-iojs,infosiftr/docker-iojs,hmalphettes/docker-iojs,nodejs/docker-iojs