Ensure npm on correct version

src/freedombone-utils-nodejs

 /usr/bin/curl -0 -L https://npmjs.org/install.sh | sh
 npm install -g n@${NODEJS_N_VERSION} --save
 n ${NODEJS_VERSION}
-npm upgrade -g npm@{NPM_VERSION}
-npm install -g npm@{NPM_VERSION}
-npm install -g pug@2.0.0-beta6
-npm install -g graceful-fs@4.1.10
-npm install -g minimatch@3.0.3
+npm upgrade -g npm@{NPM_VERSION} --save
+npm install -g pug@2.0.0-beta6 --save
+npm install -g graceful-fs@4.1.10 --save
+npm install -g minimatch@3.0.3 --save
 exit 0
 EOF
     chmod +x /root/install-nodejs.sh
         fi
     fi
 
+    # ensure npm on correct version
+    npm install -g npm@{NPM_VERSION} --save
+
     mark_completed $FUNCNAME
 }