Add mime-type application/xhtml+xml to StreamGenerator

[Michael Wechner]

Hi

It seems to me that the mime-type application/xhtml+xml was missing from 
the StreamGenerator, so
I have added it.
Please let me know if this is causing any inconvenience.

Thanks

Michi

--
Michael Wechner
Wyona      -   Open Source Content Management   -    Apache Lenya
http://www.wyona.com                      http://lenya.apache.org
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+41 44 272 91 61