Adds init-node-libs and update-node-libs targets.
Squashed 'deps/node-libs/' content from commit a4b0d91

git-subtree-dir: deps/node-libs
git-subtree-split: a4b0d9140f236943f0338615b18e6953b0a2c2af
Merge commit '93434da531a1b177912a961d88048cf755a0f75a' as 'deps/node-libs'