[Nodeshot] Automated install procedure docs

[Stefano Tonazzi]

Hi all,
in the link below you can find the docs describing the automated install 
procedure of a new Nodeshot instance,
as well as the documentation on how to easily perform updates for an 
already existing one.

http://nodeshot.readthedocs.org/en/latest/topics/automated_install.html
http://nodeshot.readthedocs.org/en/latest/topics/automated_install.html#update-an-instance

Stefano