Ensure npm version is installed

src/freedombone-app-jitsi

     apt-get -yq install wget debconf-utils default-jre
     install_nodejs jitsi
     npm install -g browserify@13.1.1
+    if [ ! "$?" = "0" ]; then
+        remove_nodejs jitsi
+        exit 638352
+    fi
     if ! grep "jitsi" /etc/apt/sources.list; then
         echo "deb http://download.jitsi.org/nightly/deb ${jitsi_deb_repo}/" >> /etc/apt/sources.list
     fi

src/freedombone-utils-nodejs

 cp /usr/bin/nodejs /usr/local/bin/node
 cp /usr/bin/nodejs /usr/bin/node
 /usr/bin/curl -0 -L https://npmjs.org/install.sh | sh
+npm install -g npm@{NPM_VERSION}
 npm install -g n@${NODEJS_N_VERSION} --save
 n ${NODEJS_VERSION}
-npm update -g npm@{NPM_VERSION}
+npm upgrade -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