def substitute_parameters
      @executables_inputs.each_pair do |exe, inputs|
        inputs.each_pair do |name, value|
          case exe
            when RightScale::RecipeInstantiation
              exe.attributes[name] = value.content
            when RightScale::RightScriptInstantiation
              exe.parameters[name] = value.content
          end
        end
      end
    end
def substitute_parameters
      @executables_inputs.each_pair do |exe, inputs|
        inputs.each_pair do |name, value|
          case exe
            when RightScale::RecipeInstantiation
              exe.attributes[name] = value.content
            when RightScale::RightScriptInstantiation
              exe.parameters[name] = value.content
          end
        end
      end
    end
Do the actual substitution of credential values into the bundle