PDFBox tests include copyright files

The test files for PDFBox, FontBox, and Preflight include several files under copyright which we probably don't have permission to redistribute, and need to be removed (or preferably replaced):

pdfbox/src/test/resources/org/apache/pdfbox/

• ttf/ArialMT.ttf (This is actually Bitstream Vera Sans - the license on this might be ok though?)
• pdfparser/gdb-refcard.pdf (GPL licensed)
• pdmodel/page_label.pdf (Edited by Foxit PDF for Evaluation Only)
• pdmodel/font/256.pdf (Copyright 2004 Journal of Combinatorics)

fontbox/src/test/resources/ttf/

• testTrueType.ttf (NewBaskerville, Copyright © 2002 Veronika Elsner)

preflight/src/test/resources/org/apache/padaf/preflight/font/

• true_type.ttf (Subset of Microsoft Arial)