Fix UnicodeEncodeError by using StringIO
Fix UnicodeEncodeError by using StringIO

instead of cStringIO

kobotoolbox/kobocat,awemulya/fieldsight-kobocat,kobotoolbox/kobocat,kobotoolbox/kobocat,kobotoolbox/kobocat,awemulya/fieldsight-kobocat,awemulya/fieldsight-kobocat,awemulya/fieldsight-kobocat