docker-node / PatternLab Handlebar container runner

* jgwill/node:patternlab with Handlebar Demo
* Running the infrastructure easiely with the demo

Execute

``sh
mkdir mydemo && cd $_
npm i jgwill-docker-node-patternlab-demo-handlebar
cd node_modules/jgwill-docker-node-patternlab-demo-handlebar
npm start

Open a browser http://127.0.0.1:3000

``