[TYPO3-core] Further correction to MIME type determination

[Stanislas Rolland]

This is a CVS patch request.

Type: Bugfix

Description: MIME type may contain dot(.) and plus(+) characters.

Branches: HEAD / TYPO3_4-0

Bugtracker reference: http://bugs.typo3.org/view.php?id=3172

With kind regards,
Stanislas

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