def remove_all_instances(var)
      # Iterate though all the site configs, removing every instance of :var
      # Return an array containing the value of :var at each config,
      # from lowest priority to highest.
      # If [] is returned, it implies that there was no instancs of :var to be removed.
      ret = []
      configs.each do |c|
        if c.has_var?(var)
          ret << c.remove_var(var)
        end
      end
      ret
    end
def remove_all_instances(var)
      # Iterate though all the site configs, removing every instance of :var
      # Return an array containing the value of :var at each config,
      # from lowest priority to highest.
      # If [] is returned, it implies that there was no instancs of :var to be removed.
      ret = []
      configs.each do |c|
        if c.has_var?(var)
          ret << c.remove_var(var)
        end
      end
      ret
    end
Dynamically remove all the instances of :var