Travis: Simplify node install
Travis: Simplify node install

interpretor/zeromq.js,lgeiger/zmq-prebuilt,lgeiger/zmq-prebuilt,lgeiger/zmq-prebuilt,interpretor/zeromq.js,lgeiger/zmq-prebuilt,lgeiger/zmq-prebuilt,interpretor/zeromq.js,interpretor/zeromq.js,interpretor/zeromq.js