PDFBOX-375: Rename org.pdfbox packages to org.apache.pdfbox

Created a branch from before the package renaming to simplify handling of old patches.

git-svn-id: https://svn.apache.org/repos/asf/incubator/pdfbox/branches/before-apache-packages@696521 13f79535-47bb-0310-9956-ffa450edef68