Add node 4.6.1, remove node 4.6.0
Add node 4.6.1, remove node 4.6.0

[#132686391]

Signed-off-by: Jacques Chester <8f1e729cbc4d489c19883827c4c21d9fbbde0732@pivotal.io>

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