Upgrade production node version to v0.10.24

If the installed node version doesn't match the configured version, it
will be upgraded.

This also switches to using the pre-built binaries from nodejs.org,
which significantly reduces the install time for a new version of node.
Add process.versions output to dev helpers

This makes it easier to see which version of node you're currently
running, along with other useful information about which software node
was compiled with.