PDFBOX-2105: added support and test for multipage tiffs

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/branches/1.8@1598926 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2105: added support and test for multipage tiffs

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/branches/1.8@1598928 13f79535-47bb-0310-9956-ffa450edef68