Use PCRE_UTF8 so unicode strings don't break up.
Use PCRE_UTF8 so unicode strings don't break up.

The `Truncator`-class fails when the truncated text contains unicode characters with a nice exception:

    "DOMDocumentFragment::appendXML(): Entity: line 1: parser error : Input is not proper UTF-8, indicate encoding ! Bytes: 0xC3 0xE2 0x80 0xA6"

By using the `PCRE_UTF8` modifier `u` everything is UTF8 and all is fine.
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