PDFBOX-1194: XMLValueTypeDescriptionManagerTest fails on Java 7
PDFBOX-1194: XMLValueTypeDescriptionManagerTest fails on Java 7

Upgrade to XStream version 1.4.2 to get the fix to http://jira.codehaus.org/browse/XSTR-651

git-svn-id: c3ad59981690829a43dc34c293c4e2cd04bcd994@1220780 13f79535-47bb-0310-9956-ffa450edef68

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