Add instructions/script to update node

the default version of node in ubuntu is very old, 4.x
either add instruction on how to update or add it to the prerequisite script.


and update node-gyp-install as well

@ric96 Thanks for your suggestion and I will check it in ubuntu 14.04 64bit.

Or you can contribute it in https://github.com/webosose/build-webos/blob/master/scripts/prerequisites.sh

@Changhyeok
you can test using this pr https://github.com/webosose/build-webos/pull/4

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