Upgrade Node.js from 0.10.29 to 0.10.32

Pull in the latest and greatest. I've added this to the PPA:

https://launchpad.net/~gds/+archive/ci

As far as I'm aware there are no applications that have a specific
version dependency for Node.js, and Performance Platform are the
heaviest users.
Merge pull request #218 from alphagov/upgrade-nodejs-10-32

Upgrade Node.js from 0.10.29 to 0.10.32