PDFBOX-283: output field value as hex string

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1587616 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2032: loop nbGroups times, not nbGroups+1 times, as observed by Simon Steiner

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1587950 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-1990: improve example(s) to allow lossless images, and scaling

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1587975 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'apachepdfbox/trunk' into trunk