Empty all protected attributes when integrate strong_parameters

[route]

For Rails 4 attr_accessible and attr_protected were extracted, so it's not problem to set these attributes with strong_parameters but for rails 3 it AR protects default attributes and it's impossible to set them even if they passed by strong_parameters

1.9.3p385 :001 > raw_parameters = { :id => 1, :type => 'MediaFile' }
 => {:id=>1, :type=>"MediaFile"} 
1.9.3p385 :002 > parameters = ActionController::Parameters.new(raw_parameters)
 => {"id"=>1, "type"=>"MediaFile"} 
1.9.3p385 :003 > gift = Gift.new(parameters.permit(:id, :type))
ActiveModel::MassAssignmentSecurity::Error: Can't mass-assign protected attributes: id, type

[route]

Oh and seems like it's related to #81

[atipugin]

Would be nice to see it in master.