rename_key

# File activesupport/lib/active_support/core_ext/hash/conversions.rb, line 154
        def rename_key(key, options = {})
          camelize  = options.has_key?(:camelize) ? options[:camelize]   : ActiveSupport.camelize_xml
          dasherize = options.has_key?(:dasherize) ? options[:dasherize] : ActiveSupport.dasherize_xml
          key = key.camelize if camelize
          key = key.dasherize if dasherize
          key
        end