Gp.recipe.node

========

- Allow to install only node/npm

========

- Now use binary distribution on linux and osx by default. Mean that the recipe
no longer require gcc and the installation is way much faster.

- Raise an error if a script does not exist

- Use package version to get the node.js version to install

===

- Change npm install script location
[Ross Pfahler]

===

- Created recipe with ZopeSkel
[Gael Pasgrimaud]