Remove all warnings in gem. (ruby -w)

This seems to be unused and actually generated this warning upon requiring numbers_and_words (in Ruby 1.9.3):

ruby-1.9.3-p327/gems/numbers_and_words-0.7.1/lib/numbers_and_words/i18n/initialization.rb:13: warning: method redefined; discarding old languages

This fix eliminates the warning.