Update to Node.js 4.4.2
Update to Node.js 4.4.2

As per https://nodejs.org/en/blog/vulnerability/npm-tokens-leak-march-2016/, Node.js 4.4.2 fixes an npm security vulnerability.
dlorenc/nodejs-docker,GoogleCloudPlatform/nodejs-docker,GoogleCloudPlatform/nodejs-docker,ofrobots/nodejs-docker,dlorenc/nodejs-docker,dlorenc/nodejs-docker,GoogleCloudPlatform/nodejs-docker