added the 1.6.0 release
added the 1.6.0 release

git-svn-id: c3ad59981690829a43dc34c293c4e2cd04bcd994@1142197 13f79535-47bb-0310-9956-ffa450edef68

ZhenyaM/veraPDF-pdfbox,mdamt/pdfbox,BezrukovM/veraPDF-pdfbox,gavanx/pdflearn,benmccann/pdfbox,mathieufortin01/pdfbox,ChunghwaTelecom/pdfbox,joansmith/pdfbox,ChunghwaTelecom/pdfbox,veraPDF/veraPDF-pdfbox,ZhenyaM/veraPDF-pdfbox,benmccann/pdfbox,mdamt/pdfbox,joansmith/pdfbox,torakiki/sambox,mathieufortin01/pdfbox,gavanx/pdflearn,torakiki/sambox,veraPDF/veraPDF-pdfbox,BezrukovM/veraPDF-pdfbox