Added binary installation option to download "binary" pre-compiled code from nodejs website

Hi,

I had the requirement that I need to install node v0.11.*, but compiling from source is a bit slow, therefore I implemented a third "binary" way to install nodejs - by downloading the precompiled version.

I tested the source and binary installs on a fresh ubuntu vagrant machine, there things worked as expected. 

I'm still a little new to the world of ansible so if you have any comments or want me to change things I'm happy for feedback also.