PDFBOX-2071: insert inline images in page content stream + test

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1593849 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2071: remove unused imports

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1593851 13f79535-47bb-0310-9956-ffa450edef68