PDFBOX-368: Use the Maven standard directory layout

Created a branch of the PDFBox project before the layout change. Old patches with old paths can be applied on this branch before porting to the new layout.

git-svn-id: https://svn.apache.org/repos/asf/incubator/pdfbox/branches/before-maven-layout@696508 13f79535-47bb-0310-9956-ffa450edef68