Request to add initializer option for treat_reserved_as_conflict

[timsjpark]

Just a small request to add an initializer option for the new feature for treating reserved words as conflicts. I think this feature should be disabled by default. Thanks!

FriendlyId.defaults do |config|
  # ## Reserved Words
  #
  # Some words could conflict with Rails's routes when used as slugs, or are
  # undesirable to allow as slugs. Edit this list as needed for your app.
  config.use :reserved

  config.reserved_words = %w(new edit index session login logout users admin
    stylesheets assets javascripts images)

  # This adds an option to to treat reserved words as conflicts rather than exceptions.
  # When there is no good candidate, a UUID will be appended, matching the existing
  # conflict behavior.

  # config.treat_reserved_as_conflict = true