Ship the custom node binary build with atom-shell.

This is required by the child_process.fork, which is indeed executing
the node binary to start a script.

The node fork can be found at:
https://github.com/atom/cefode-node/tree/chromium-v8

script/update

@@ -4,6 +4,8 @@ set -e
 
 cd "$(dirname "$0")/.."
 
+./script/update-node v0.10.5
+
 gyp --depth . atom.gyp \
   -Ivendor/brightray/brightray.gypi \
   -Dtarget_arch=ia32 \