PDFBOX-2126: Improve handling of clipping path - thanks to Petr Slaby

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1606283 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2126: clean up

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1606284 13f79535-47bb-0310-9956-ffa450edef68