merged the following changes from trunk

PDFBOX-1515 rev. 1465217
PDFBOX-1538 rev. 1460370
PDFBOX-1547 rev. 1461796
PDFBOX-1549 rev. 1465359
PDFBOX-1551 rev. 1465163
PDFBOX-1557 rev. 1465366
PDFBOX-1558 rev. 1465360
PDFBOX-1559 rev. 1465266
DOAP file rev. 1460372



git-svn-id: https://svn.apache.org/repos/asf/pdfbox/branches/1.8@1465396 13f79535-47bb-0310-9956-ffa450edef68