Revert "Add node 4.8.4, remove node 4.8.5"
Revert "Add node 4.8.4, remove node 4.8.5"

This reverts commit b4b14dd0b6eca10e00ff4b70e771fb3240fcb122.

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