install nodejs 0.6.2 and railwayjs on ubuntu
过程略碰上点小麻烦，存档如下：1.append source:
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs
2. install latest npm and nodejs
sudo apt-get install npm nodejs
3. install railwayjs
npm install railway -g
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