Change nodejs installation within image

src/freedombone-image-customise

 }
 
 function image_install_nodejs {
-    if [ $INSTALLING_MESH ]; then
-        return
-    fi
-
-    chroot "$rootdir" apt-get -yq install nodejs curl
-
-    if [ ! -f $rootdir/usr/bin/nodejs ]; then
-        echo $'nodejs was not installed'
-        exit 63962
-    fi
+    mesh_install_nodejs
+    echo 'install_nodejs' >> ${rootdir}/root/${PROJECT_NAME}-completed.txt
 }
 
 function image_preinstall_repos {

src/freedombone-utils-nodejs

 
 function mesh_install_nodejs {
     # Note: this has to be jessie for now
-    if [ ! -d ${rootdir}/$INSTALL_DIR ]; then
-        mkdir ${rootdir}/$INSTALL_DIR
-    fi
-    chroot "${rootdir}" wget -qO- https://deb.nodesource.com/gpgkey/nodesource.gpg.key > $INSTALL_DIR/node.gpg.key
-    chroot "${rootdir}" apt-key add $INSTALL_DIR/node.gpg.key
+    wget -qO- https://deb.nodesource.com/gpgkey/nodesource.gpg.key > ${rootdir}/root/node.gpg.key
+    chroot "${rootdir}" apt-key add /root/node.gpg.key
     echo "deb https://deb.nodesource.com/node_7.x jessie main" > ${rootdir}/etc/apt/sources.list.d/nodesource.list
     echo "deb-src https://deb.nodesource.com/node_7.x jessie main" >> ${rootdir}/etc/apt/sources.list.d/nodesource.list
     chroot "${rootdir}" apt-get update
     fi
 
     # Note: this has to be jessie for now
-    if [ ! -d $INSTALL_DIR ]; then
-        mkdir $INSTALL_DIR
-    fi
-    cd $INSTALL_DIR
-    wget -qO- https://deb.nodesource.com/gpgkey/nodesource.gpg.key > $INSTALL_DIR/node.gpg.key
-    apt-key add $INSTALL_DIR/node.gpg.key
+    wget -qO- https://deb.nodesource.com/gpgkey/nodesource.gpg.key > /root/node.gpg.key
+    apt-key add /root/node.gpg.key
     echo "deb https://deb.nodesource.com/node_7.x jessie main" > /etc/apt/sources.list.d/nodesource.list
     echo "deb-src https://deb.nodesource.com/node_7.x jessie main" >> /etc/apt/sources.list.d/nodesource.list