use npm from install

install.sh

@@ -190,8 +190,9 @@ dap_dl_bash "https://git.daplie.com/coolaj86/node-install-script/raw/master/setu
 # OS X or Linux
 $sudo_cmd chown -R $(whoami) /opt/goldilocks/ || true
 
-npm install -g npm@4
-npm install -g 'git+https://git@git.daplie.com/Daplie/goldilocks.js.git#v1'
+my_npm="$NPM_CONFIG_PREFIX/bin/npm"
+$my_npm install -g npm@4
+$my_npm install -g 'git+https://git@git.daplie.com/Daplie/goldilocks.js.git#v1'
 # Finish up with submodule
 pushd /opt/goldilocks/lib/node_modules/goldilocks
 bash ./update-packages.sh