Ruby

• lib/cgi/util.rb (CGI.escape): support a string with invalid byte
  sequence.

• test/cgi/test_cgi_util.rb
  (test_cgi_escape_with_invalid_byte_sequence): test for the above
  change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34346 b2dd03c8-39d4-4d8f-98ff-823fe69b080e