Add superscript/subscript styling in Excel2007 Writer
https://github.com/PHPOffice/PHPWord/issues/34

PHPWord_Shared_String.IsUTF8 returns FALSE for Cyrillic UTF-8 input
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Merge pull request #37 from RomanSyroeshko/PHPWord#34

PHPWord_Shared_String.IsUTF8 returns FALSE for Cyrillic UTF-8 input
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