fix (devkit cli): add support for nodejs vs node
fix (devkit cli): add support for nodejs vs node

On some linux systems (debian, others?), the node package name is
already taken, and the node binary we are expecting is named nodejs.
This changes the devkit command line script to try nodejs first, then
fall back to node.

Tested on OS X 10.9.5 and Ubuntu 14.04.1.

gameclosure/devkit,gameclosure/devkit,gameclosure/devkit