Use mb_chars to prevent slicing multibyte chars under ruby 1.8

mb_chars provides a multibyte-aware wrapper for strings. It should
have no effect on ruby 1.9.3 and above. Although ruby 1.8.7 wouldn't
raise errors on a badly sliced multibyte string, on upgrading to ruby
1.9.3 and above, string operations such as gsub, match and join may
produce ArgumentErrors with the message "invalid byte sequence in UTF-8".
Additionally, a database with 'UTF-8' encoding may produce the error
"PG::CharacterNotInRepertoire: ERROR:  invalid byte sequence for encoding "UTF8""

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