Add node 4.7.0, remove node 4.6.2
Add node 4.7.0, remove node 4.6.2

source url: https://nodejs.org/dist/v4.7.0/node-v4.7.0.tar.gz, source sha256: 0bc45fc02e425746001a8f012d6781fa5da6e629a43654c84ab7e767368fec61

[#135648535]

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