* lib/matrix.rb: resolve 'ruby -w' warnings.
* lib/irb/locale.rb: resolve 'ruby -w' warnings.
* lib/irb/multi-irb.rb: resolve 'ruby -w' warnings.
* lib/irb/ruby-lex.rb: fix problem for "\\M-\\..." and "\\C-\\..."
  and resolve 'ruby -w' warnings.
* lib/irb/ruby-token.rb: fix typo
* lib/shell/command-processor.rb: resolve 'ruby -w' warnings.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@1551 b2dd03c8-39d4-4d8f-98ff-823fe69b080e