Add node 6.11.5, remove node 6.11.4
Add node 6.11.5, remove node 6.11.4

source url: https://nodejs.org/dist/v6.11.5/node-v6.11.5.tar.gz
source sha256: c4aed94e82dbf246a1c9e0705c3054f0c0f3d9c4d8d025d877e0ef1f7b6cde4c

[#152545523]

cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack