default node version updated from `0.10.2` to `0.10.6` (fixes build error on Ubuntu 12.10)

Added version number and sha256 checksums for nodejs `0.10.6`. Fixes build issue on Ubuntu `12.10`, see https://github.com/hectcastro/chef-statsd/issues/14#issuecomment-17441555
Merge pull request #45 from wtw/patch-1

Updated default node version from 0.10.2 to 0.10.6 (fixes build error on Ubuntu 12.10)