install / update nodejs

nodejs install

# cat node.sh 
#!/bin/bash
[ -d 'node' ] || git clone git://github.com/joyent/node.git node || exit 1
(
    cd node || exit 1
    git pull
    git reset --hard
    git checkout -- .
    git clean -- .
    ./configure --prefix=/usr/local/
    CPU_COUNT=$(($(grep processor /proc/cpuinfo |sed 's/.*://'|tail -n1) + 1))
    JOBS=$(( $CPU_COUNT + $CPU_COUNT / 3 ))
    make -j$JOBS && \
    make install
)