A few correction after my first installation experienced on a Debian Jessie
A few correction after my first installation experienced on a Debian Jessie

A few correction for the CR

Add graphicsmagick and graphicsmagick-imagemagick-compat as required packages

OR-1161 Some fix of documentation for installation on Debian Jessie

heroandtn3/openpaas-esn,heroandtn3/openpaas-esn,heroandtn3/openpaas-esn