Change source of npm/node.js

[ghost]

curl -sL https://deb.nodesource.com/setup | sudo bash -
sudo apt-get install -y nodejs

Ref: https://github.com/nodesource/distributions

For v0.12 (not in releases yet): nodesource/distributions#63 (comment)

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[unsystemizer]

Completed in a20696e