merged the following changes from trunk into b1.8 branch:

PDFBOX-823	r1540811
PDFBOX-837	r1538341
PDFBOX-1540     r1469999,r1470242,r1470107,r1494083
PDFBOX-1576	r1530018
PDFBOX-1606 	r1521194
PDFBOX-1607 	r1536441
PDFBOX-1613 	r1488049
PDFBOX-1629 	r1490408
PDFBOX-1630 	r1497532
PDFBOX-1643 	r1495802,r1495803
PDFBOX-1653 	r1519174
PDFBOX-1674 	r1515101
PDFBOX-1690 	r1538394



git-svn-id: https://svn.apache.org/repos/asf/pdfbox/branches/1.8@1542711 13f79535-47bb-0310-9956-ffa450edef68