Add node 4.8.1, remove node 4.8.0
Add node 4.8.1, remove node 4.8.0

source url: https://nodejs.org/dist/v4.8.1/node-v4.8.1.tar.gz
source sha256: 0cdc67fb2df091414447e2e1750b371be99a7b61c11ade0261ce5bab845e9dd1

[#142185261]

cloudfoundry/ruby-buildpack,ekaranto/rails4-bluemix-buildpack,cloudfoundry/ruby-buildpack,ekaranto/rails4-bluemix-buildpack,ekaranto/rails4-bluemix-buildpack,cloudfoundry/ruby-buildpack,ekaranto/rails4-bluemix-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack