Add node 4.8.4, remove node 4.8.4
Add node 4.8.4, remove node 4.8.4

source url: https://nodejs.org/dist/v4.8.4/node-v4.8.4.tar.gz
source sha256: b5480f69e9e929d2814de900fb5e673743a9d93f4fecbd79066baf18219f8584

cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack