iojs: update Dockerfile
iojs: update Dockerfile

Fixing the platform. The node.js platform is not compatible anymore with
this one.

Anyway, we should deprecate this platform and use the node.js with nvm
installing io.

keymon/basebuilder,actionjack/basebuilder,emerleite/basebuilder,tsuru/basebuilder,keymon/basebuilder,axelerant/basebuilder,axelerant/basebuilder,jusbrasil/basebuilder,marcuskara/basebuilder,actionjack/basebuilder,ChangjunZhao/basebuilder,keymon/basebuilder,ChangjunZhao/basebuilder,marcuskara/basebuilder,ChangjunZhao/basebuilder,jusbrasil/basebuilder,keymon/basebuilder,keymon/basebuilder,marcuskara/basebuilder,keymon/basebuilder,emerleite/basebuilder,actionjack/basebuilder,keymon/basebuilder,jusbrasil/basebuilder,tsuru/basebuilder,keymon/basebuilder,axelerant/basebuilder,emerleite/basebuilder