Updated the charm to use the new node versions
Updated the charm to use the new node versions

The issue causing the original revert to node 0.8
has been resolved so we are now allowing the charm to
use the latest version of node.

R=gary.poster, bcsaller
CC=
https://codereview.appspot.com/8105043

juju/juju-gui-charm,juju/juju-gui-charm